2023
“Modeling a solar pressurized volumetric receiver integrated in a parabolic dish: Off-design heat transfers, temperatures, and efficiencies”
J. García-Ferrero, R.P. Merchán Corral, M.J. Santos Sánchez, A. Medina Dominguez, A. Hernández-Clavo, P. Canhoto & A. Giostri
Energy Conversion and Management, 293, 117436.
https://doi.org/10.1016/j.enconman.2023.117436
(Impact Factor WOS 11,53 Q1). 
P1_GraciaFerrero2023Modelling
“Operating performance of a Joule-Brayton pumped thermal energy storage system integrated with a concentrated solar power plant”
M. Cascetta, F. Licheri, R.P. Merchán Corral & M. Petrollese, M.
Journal of Energy Storage, 73, 108865.
https://doi.org/10.1016/j.est.2023.108865
(Impact Factor WOS 8.907 Q1). p1_Cascetta2023operating
“A novel electrochemical system with adiabatic pre-charging and pre-discharging processes for efficient refrigeration”
B. Chen, J. Gonzaález-Ayala, A. Hernández-Calvo, R. Luo, H. Yang & J. Guo
Energy Conversion and Management, 293, 117518.
https://doi.org/10.1016/j.enconman.2023.117518
(Impact Factor WOS 11,53 Q1). P1_BoChen2023Anovel
“Thermodynamic performance of coupled enzymatic reactions: A chemical kinetics model for analyzing cotransporters, ion pumps, and ATP synthases”
J. González-Ayala, A. Calvo-Hernández, M. Santillán
Biophysical Chemistry, 2023
https://doi.org/10.1016/j.bpc.2022.106932
(Impact Factor WOS 3.63 Q2). P1_GonzalezAyala2023Thermodynamic
“A two-stage sodium converter coupled to a two-stage TEG: Parametric optimization”
W. Peng, J. Gonzalez-Ayala, J. Guo, J. Dong, Q. Qin
Applied Thermal Engineering 229, 120560
https://doi.org/10.1016/j.applthermaleng.2023.120560
(Impact Factor WOS 6,47 Q1). P1_Wanli2023AtwoStage
2022
“Pumped heat energy storage with liquid media: Thermodynamic assessment by a transcritical Rankine-like model”
D. Salomone-González, P.L. Curto-Risso, A. Calvo-Hernández, A: Medina, J.M. M. Roco, J. González-Ayala
Journal of Energy Storage, 2022
https://doi.org/10.1016/j.est.2022.105966
(Impact Factor WOS 8.907 Q1). P1_Salomone2022Pumped
“Brayton technology for Concentrated Solar Power plants: Comparative analysis of central tower plants and parabolic dish farms”
J Garcia-Ferrero, R. P. Merchán, M. J. Santos, A. Medina, A. Calvo-Hernández
Energy Conversion and Management, 2022
https://doi.org/10.1016/j.enconman.2022.116312
(Impact Factor WOS 11,53 Q1). P1_GarciaFerrero2022Brayton
“Low-dissipation model of three-terminal refrigerator: performance bounds and comparative analyses”
J. González-Ayala, Yang Hanxin, Guo, Juncheng, A. Calvo-Hernández
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL, 2022
https://doi.org/10.1088/1751-8121/ac47b0
(Impact Factor WOS 2.331 Q1). P1_Zhexu2022LowDissipation
“Success versus failure: Efficient heat devices in thermodynamics”
J. González-Ayala, A. Calvo-Hernández, J. A. White, A. Medina, J. M. M. Roco, S. Velasco
Physical Review E, 2022
https://doi.org/10.1103/PhysRevE.105.014115
(Impact Factor WOS 2.707 Q1).
2021
“High Temperature Central Tower Plants for Concentrated Solar Power: 2021 Overview”
R.P. Merchán, M.J. Santos, A. Medina, A. Calvo Hernández,
Renewable and Sustainable Energy Reviews, 2021
https://doi.org/10.1016/j.rser.2021.111828
(Impact Factor WOS 14.982 Q1). Merchan2021High
“Thermodynamic Performance of a Brayton Pumped Heat Energy Storage System: Influence of Internal and External Irreversibilities”
David Pérez-Gallego, Julian Gonzalez-Ayala, Antonio Calvo Hernández, and Alejandro Medina
Entropy 2021, 23(12), 1564;
https://doi.org/10.3390/e23121564
(Impact Factor WOS 2.524 Q2; CiteScore Scopus 4.0 Q1). P1_PerezGallego2021Thermodynamic
“Thermo-economic and sensitivity analysis of a central tower hybrid Brayton solar plant”
R.P. Merchán, M.J. Santos, J. García-Ferrero, A. Medina, A. Calvo Hernández.
Applied Thermal Engineering, 2021, 186, 116454
DOI: https://doi.org/10.1016/j.applthermaleng.2020.116454
(Impact Factor WOS 6.583 Q1, D1; CiteScore Scopus 6.0 Q1) P01_Merchan2020Thermo_economic
“Multicriteria optimization of Brayton-like pumped thermal electricity storage with liquid media”
J. Gonzalez-Ayala, D. Salomone-González, A. Medina, J.M.M. Roco, P.L. Curto and A. Calvo Hernández
Journal of Energy Storage 44, 103242 (2021)
https://doi.org/10.1016/j.est.2021.103242
(Impact Factor WOS 9.709 Q1, D1; CiteScore Scopus 15.9 Q1, D1) P1_GonzalezAyala2021Multicriteria
“Solar-driven sodium thermal electrochemical converter coupled to a Brayton heat engine: Parametric optimisation”
W. Peng, J. Gonzalez-Ayala, G. Su, J Chen, A.C. Hernández
Renewable Energy 164, 260-271 (2021)
https://doi.org/10.1016/j.renene.2020.09.084
(Impact Factor WOS 8.001 Q1; CiteScore Scopus 10.8 Q1) P1_Wanli2021SolarDriven
2020
“Thermodynamic and Cost Analysis of a Solar Dish Power Plant in Spain Hybridized with a Micro-Gas Turbine”
J. García-Ferrero, I. Heras, M.J. Santos, R.P. Merchán, A. Medina, A. González, A. Calvo Hernández.
Energies 2020, 13(19), 5178 https://doi.org/10.3390/en13195178
(Impact Factor WOS 3.004 Q3). P1_GarciaFerrero2020Thermodynamic
“Optimization, Stability, and Entropy in Endoreversible Heat Engines”
Gonzalez-Ayala, J., Mateos Roco, J. M., Medina, A., & Calvo Hernández, A.
Entropy (2020), 22(11), 1323
https://www.mdpi.com/1099-4300/22/11/1323 GonzalezAyala2020Optimization
(Impact Factor WOS 2.524 Q2; CiteScore Scopus 4.0 Q1).
“A two-stage sodium thermal electrochemical converter: Parametric optimization and performance enhancement”
W. Peng, J. Gonzalez-Ayala, S. Su, J. Chen, A.C. Hernández
Journal of Power Sources 480, 229147 (2020)
https://doi.org/10.1016/j.jpowsour.2020.229147
(Impact Factor WOS 9.127 Q1; CiteScore Scopus 14.4Q1, D1) P1_Wanli2020ATwoStage
“Pumped heat energy storage with liquid media: Thermodynamic assessment by a Brayton-like model”
Salomone-González, D., González-Ayala, J., Medina, A., Roco, J. M. M., Curto-Risso, P. L., & Hernández, A. C.
Energy Conversion and Management (2020), 226, 113540
(Impact Factor WOS 9.709 Q1). Salomone2020Pumped
“On‐ and off‐design thermodynamic analysis of a hybrid polar solar thermal tower power plant”
R:P. Merchán Corral, M.J. Santos Sánchez, A. Medina Domínguez and A. Calvo-Hernández
International Journal of Energy Research (2020) https://doi.org/10.1002/er.5854
(Impact Factor WOS 4.380 Q1). p1Merchan2020Onandoff
“Thermodynamic optimisation subsumed in stability phenomena”
Gonzalez-Ayala, J., Medina, A., Roco, J. M. M., & Hernández, A. C.
Scientific RepoRtS, (2020) 10(1), 1-16. GonzalezAyala2020Thermodynamic
(Impact Factor WOS 14.982 Q1).
“An alkali metal thermoelectric converter hybridized with a Brayton heat engine: Parametric design strategies and energetic optimization.”
Peng, W., Gonzalez-Ayala, J., Guo, J., Chen, J., & Hernández, A. C.
Journal of Cleaner Production (2020): 120953. WanliPeng2020AnAlkaly
(Impact Factor WOS 7.2446 Q1).
“Energetic self-optimization induced by stability in low-dissipation heat engines.”
Gonzalez-Ayala, J., Guo, J., Medina, A., Roco, J. M. M., & Hernández, A. C.
Physical Review Letters 124.5 (2020): 050603. GonzalezAyala2020Energetic
(Impact Factor WOS 9.161 Q1).
“On-design pre-optimization and off-design analysis of hybrid Brayton thermosolar tower power plants for different fluids and plant configurations.”
Merchán, R. P., Santos, M. J., Heras, I., Gonzalez-Ayala, J., Medina, A., & Hernández, A. C.
Renewable and Sustainable Energy Reviews 119 (2020): 109590. Merchan2020OnDesign
(Impact Factor WOS 12.110 Q1).
“Techno-Economic Analysis of a Solar Hybrid Combined Cycle Power Plant Integrated with a Packed Bed Storage at Gas Turbine Exhaust”
Trevisan, S., Merchán Corral, R. P., Guédez, R., Santos Sánchez, M. J., Medina Domínguez, A., Laumert, B., & Calvo Hernández, A.
AIP Conference Proceedings, 2303. 130009 (2020).
Trevisan2019TechnoEconomic
2019
“Thermally driven refrigerators: Equivalent low-dissipation three-heat-source model and comparison with experimental and simulated results.”
Guo, J., Yang, H., Zhang, H., Gonzalez-Ayala, J., Roco, J. M. M., Medina, A., & Hernández, A. C.
Energy Conversion and Management 198 (2019): 111917. Juncheng2019Thermally
(Impact Factor WOS 8.208 Q1).
“Continuous power output criteria and optimum operation strategies of an upgraded thermally regenerative electrochemical cycles system. ”
Guo, J., Wang, Y., Gonzalez-Ayala, J., Roco, J. M. M., Medina, A., & Hernández, A. C.
Energy conversion and management 180 (2019): 654-664. Juncheng2019Continuos
(Impact Factor WOS 8.208 Q1).
“Optimization induced by stability and the role of limited control near a steady state.”
Gonzalez-Ayala, J., Guo, J., Medina, A., Roco, J. M. M., & Hernández, A. C.
Physical Review E 100.6 (2019): 062128. GonzalezAyala2019Optimization
(Impact Factor WOS 2.296 Q1).
“Towards a more efficient generation of central tower hybrid thermosolar gas turbine power plants.”
Merchán, R. P., Medina, A., Santos, M. J., Heras, I., Roco, J. M. M., & Hernández, A. C.
AIP Conference Proceedings. Vol. 2126. No. 1. AIP Publishing LLC, 2019. Merchan2019Towards
2018
“Thermodynamic simulation of a hybrid thermo-solar externally fired gas turbine power plant fueled with biomass.”
Ghazarian, A., De León, D., Galione, P., Curto-Risso, P., Medina, A., & Calvo, A.
AIP Conference Proceedings. Vol. 2033. No. 1. AIP Publishing LLC, 2018. Ghazarian2018Thermodynamic
“Thermodynamic model of a hybrid Brayton thermosolar plant.”
Merchán, R. P., Santos, M. J., Medina, A., & Hernández, A. C.
Renewable Energy 128 (2018): 473-483. Merchan2018Thermodynamic
(Impact Factor WOS 5.439 Q1).
“Optimization and Stability of Heat Engines: The Role of Entropy Evolution”
Gonzalez-Ayala, J., Santillán, M., Santos, M.J., Calvo Hernández, A., & Mateos Roco, J.
Entropy, 20(11), 865.(2018).
https://doi.org/10.1103/PhysRevE.97.022139 Gonzalez_Entropy_Optimizacion_2018
Roads to improve the performance of hybrid thermosolar gas turbine power plants: Working fluids and multi-stage configurations
M.J. Santos, C. Miguel-Barbero, R.P. Merchán, A. Medina, and A. Calvo Hernández,
Energy conversion and Management, 165: 578-592, (2018)
https://doi.org/10.1016/j.enconman.2018.03.084 Santos_ECM_Roads_2018
Link between optimization and local stability of a low dissipation heat engine: dynamic and energetic behaviors
J. González-Ayala, M. Santillán, I. Reyes-Ramírez, and A. Calvo Hernández
Phys. Rev. E 98032142 (2018); ISI Impact: 2.284 (Q1)
https://doi.org/10.1103/PhysRevE.98.032142 Gonzalez_PRE_Link_2018
On entropy research analysis: cross-disciplinary knowledge transfer
R. Basurto-Flores, L. Guzmán-Vargas, S. Velasco, A. Medina, and A. Calvo Hernández
Scientometrics, 117, 123-139 (2018); ISI Impact: 2.173 (Q2)
https://doi.org/10.1007/s11192-018-2860-1 Basurto_Scientometrics_OnEntropy_2018
Entropy generation and unified optimization of Carnot-like and low-dissipation refrigerators
J. González- Ayala, A. Medina, J.M.M. Roco, and A. Calvo Hernández
Phys.Rev. E, 97, 022139 (2018); ISI Impact: 2.284 (Q1)
https://doi.org/10.1103/PhysRevE.97.022139 GonzalezAyala_PRE_Entropy_2018
Symbolic analysis of the cycle-to-cycle variability of a gasoline-hydrogen fueled spark engine
Reyes-Ramírez, S.D. Martínez Boggio, P.L. Curto-Risso, A. Medina, A. Calvo Hernández, and L. Guzmán-Vargas
Energies, 11 (4) 968 (2018); ISI Impact: 2.262 (Q2)
doi:10.3390/en11040968 ReyesRamirez_Energies_Symbolic_2018
On the Effect of Thin Film Growth Mechanisms on the Specular Reflectance of Aluminium Thin Films Deposited via Filtered Cathodic Vacuum Arc.
Rincón-Llorente, G., Heras, I., Guillén Rodríguez, E., Schumann, E., Krause, M., & Escobar-Galindo, R.
Coatings, 8(9), 321. (2018). Rincon_Coatings_OnTheEffect_2018
2017
Modeling hybrid solar gas-turbine power plants: Thermodynamic projection of annual performance and emissions
Rosa Pilar Merchán; María Jesús Santos Sánchez; Israel Reyes-Ramírez; Medina, A.; Calvo Hernández, A.,
Energy conversion and Management, 134, 314- 326, (2017)
https://doi.org/10.1016/j.enconman.2016.12.044
Thermodynamic model of a hybrid Brayton thermosolar plant
R.P. Merchán, M.J. Santos, A. Medina, and A. Calvo Hernández.
Renewable Energy. 115: 89-102 (2017)
(Available online 31 May 2017) https://doi.org/10.1016/j.renene.2017.05.081
Carnot-Like Heat Engines Versus Low-Dissipation Models
Julian Gonzalez-Ayala, J. M. M. Roco, A. Medina, A. Calvo Hernández,
Entropy 19, 182 (2017)
From maximum power to a trade-off optimization of low-dissipation heat engines: Influence of control parameters and the role of entropy generation
Julian Gonzalez-Ayala, A. Calvo Hernández, and J. M. M. Roco
Phys. Rev. E. 95, 022131 (2017)
Thermodynamic simulation of a multi-step externally fired gas turbine powered by biomass
A. Durante, G. Pena-Vergara, P.L. Curto-Risso, A. Medina, and A. Calvo Hernández
Ener. Conversion and Management, 140, 182-191 (2017)
https://doi.org/10.1016/j.enconman.2017.02.050
2016
Experimental study on detailed emissions speciation of an HCCI engine equipped with a three-way catalytic converter
Jacek Hunicz, Alejandro Medina,
Energy, Volume 117, Pages 388-397, (2016)
ISSN 0360-5442, http://dx.doi.org/10.1016/j.energy.2016.06.049.
(http://www.sciencedirect.com/science/article/pii/S0360544216308234)
Irreversible and endoreversible behaviors of the LD-model for heat devices: the role of the time constraints and symmetries on the performance at maximum χ figure of merit
Julian Gonzalez-Ayala, A. Calvo Hernández and J. M. M. Roco,
J. Stat. Mech. 073202 (2016)
https://doi.org/10.1088/1742-5468/2016/07/073202
On reversible, endoreversible, and irreversible heat device cycles versus the Carnot cycle: a pedagogical approach to account for losses
Julian Gonzalez-Ayala, F. Angulo-Brown, A. Calvo Hernández, S. Velasco,
Eur. J. Phys. 37, 045103 (2016)
Seasonal thermodynamic prediction of the performance of a hybrid solar gas-turbine power plant
M.J. Santos, R.P. Merchán, A. Medina, and A. Calvo Hernández.
Energ. Convers. Manage., 115: 89-102 (2016)
https://doi.org/10.1016/j.enconman.2016.02.019
Book: Chapter XVII “Simulación termodinámica de una planta termosolar híbrida tipo Brayton”
M. J. Santos, R.P. Merchán, A. Medina, A. Calvo 267-284
Book title: “Current Trends in Energy and Sustainability. 2015 Edition”
Invited Editors: Roberto Gómez-Clavet, José M. Martínez-Duart. 2016.
Depósito legal: M-4058-2016 ISBN 978-84-608-5438-8 Capitulo_Calvet2015Current
2015
Effects of Direct Fuel Injection Strategies on Cycle-by-Cycle. Variability in a Gasoline Homogeneous Charge Compression. Ignition Engine: Sample Entropy Analysis
Jacek Hunicz, Alejandro Medina, Grzegorz Litak, Pedro L. Curto-Risso and Lev Guzmán-Vargas
Entropy 17, (2015) 
eHumicz_Entropy_Effects_2015
Thermodynamic modeling of a hybrid solar gas-turbine power plant
D. Olivenza-León, A. Medina, A. Calvo Hernández
Energ. Conv. Manage., 93, 435–447 (2015)
Olivenza_ECM_Thermodynamic_2015
Multi-objective optimization of a multi-step solar-driven Brayton plant
S. Sánchez-Orgaz, M. Pedemonte, P. Ezzatti, P.L. Curto-Risso, A. Medina, A. Calvo Hernández
Energ. Conv. Manage., 99, 346–358 (2015) S.Sánchez_ECM_Multi-objetive_2015
https://doi.org/10.1016/j.enconman.2015.04.077
The maximum power efficiency 1 −sqrt(τ) : Research, education, and bibliometric relevance
A. Calvo Hernández, J.M.M. Roco, A. Medina, S. Velasco, and L. Guzmán-Vargas
Eur. Phys. J. Special Topics, 224, 809–823 (2015) Calvo_EPJS_Maximum_2015
Time, entropy generation, and optimization in low-dissipation heat devices
A. Calvo Hernández,A. Medina, J.M.M. Roco
New J. Phys., 17,075011 (2015) CAlvo_NJP_Time_2015
Heat Devices in nonlinear irreversible thermodynamics
Izuma, Y.; Okuda, K.; Roco, J.M.M.; Calvo Hernández, A.
Phys. Review E, 91, 5, 052140, 1539-3755 (2015)
https://doi.org/10.1103/PhysRevE.91.052140
2014
Effect of ethanol addition on cyclic variability in a simulated spark ignition gasoline engine
A. K. Sen, A. Medina, P. L. Curto-Risso and A. Calvo Hernández
Meccanica 49, 2285–2297 (2014) Sen_Meccanica_Effect_2014
Heat engines and the Curzon-Ahlborn efficiency
A. Calvo Hernández, J.M.M. Roco, A. Medina, N. Sánchez-Salas
Rev. Mex. Fis. 60, 384-389 (2014) Calvo_RmexFisica_Heat_2014
Restrictions on linear heat capacities from Joule-Brayton maximum-work cycle efficiency
F. Angulo-Brown, Julian Gonzalez-Ayala, L A. Arias-Hernández
Physical Review E, 89(2), 022134 – February 2014
https://doi.org/10.1103/physreve.89.022134
2013
Recuperative solar-driven multi-step gas turbine power plants turbine power plant
S. Sánchez Orgaz, A. Medina, and A. Calvo
Energ. Conv. Manage., 67, 171 (2013) S.Sanchez_ECM_Recuperative_2013
Low-dissipation heat devices: Unified trade-off optimization and bounds
C. de Tomás, J.M.M. Roco, A. Calvo, Y. Wang, and Z.C. Tu
Phys. Rev. E, 87, 012105 (2013) deTomas_PRE_Low_2013
Coefficient of performance under optimized figure of merit in minimally nonlinear irreversible refrigerator
Y. Izumida, K. Okuda, A. Calvo, and J.M.M. Roco
EPL, 101, 10005 (2013)
Introduction to Quasi-dimensional simulation of spark ignition engines
A. Medina, P.L. Curto-Risso, A. Calvo Hernández, L. Guzmán-Vargas, F. Angulo-Brown, and A.K. Sen
Book, Springer (2013)
Coefficient of performance for a low-dissipation Carnot-like refrigerator with non adiabatic dissipation
Yong Hu, Feifei Wu, Yongli Ma, Jizhou He, Jianhui Wang, A. Calvo Hernández, and J. M. M. Roco
Phys. Rev. E, 88, 062115 (2013) Hu_PRE_Coefficient_2013
Fluctuations in the Energetic Properties of a Spark-Ignition. Engine Model with Variability
Pedro L. Curto-Risso, Alejandro Medina, Antonio Calvo-Hernández, Lev Guzmán-Vargas; and Fernando Angulo-Brown
Entropy 15,3277-3296 (2013) Curto_Entropy_Fluctuations_2013
doi:10.3390/e15083367
2012
Maximum overall efficiency for a solar-driven gas turbine power plant
S. Sánchez Orgaz, A. Medina, and A. Calvo
Int. J. Energ. Res., DOI:10.1002/er.2967 (2012) S.Sanchez_IJER_Maximun_2012
Optimal low symmetric dissipation Carnot engines and refrigerators
C. de Tomás A. Calvo, and J.M.M. Roco
Phys. Rev. E, 85, 010104 (2012) Tomas_PRE_Optimal_2012
Coefficient of performance at maximum figure of merit and its bounds for low-dissipation Carnot-like refrigerators
Y. Wang, M. Li, Z.C. Tu, A. Calvo, and J.M.M. Roco
Phys. Rev. E, 86, 011127 (2012) Wang_PRE_Coefficient_2012
2011
On cycle-to-cycle heat release variations in a simulated spark ignition heat engine
P.L. Curto-Risso, A. Medina, A. Calvo, L. Guzmán-Vargas, and F. Angulo-Brown
App. Energ., 88, 1557 (2011) Curto_APEN_Oncycle_2011
Optimizing the geometrical parameters of a spark ignition engine: Simulation and theoretical tools
P.L. Curto-Risso, A. Medina, and A. Calvo
App. Therm. Eng., 31, 803 (2011) Curto_ATE_Optimizing_2011
2010
Monofractal and multifractal analysis of simulated heat release fluctuations in a spark ignition heat engine
P.L. Curto-Risso, A. Medina, A. Calvo, L. Guzmán-Vargas, and F. Angulo-Brown
Physica A, 389, 5662 (2010) Curto_PA_Monofractal_2010
Thermodynamic model and optimization of a multi-step irreversible Brayton cycle
S. Sánchez Orgaz, A. Medina, and A. Calvo
Energ. Conv. Manage., 51, 2134 (2010) S.Sanchez_ECM_Thermodynamic_2010
2009
Optimizing the operation of an spark ignition engine: simulation and theoretical tools
P.L. Curto-Risso, A. Medina, and A. Calvo
J. Appl. Phys., 105, 094904-1 (2009) Curto_jap_spark_2009
2008
Coupled heat devices in linear irreversible thermodynamics
B. Jiménez de Cisneros and A. Calvo Hernández
Phys. Rev. E, 77, 041127-1-12 (2008) A.Calvo_PRE_coupled_2008
Theoretical and simulated models for an irreversible Otto cycle
P.L. Curto-Risso, A. Medina, and A. Calvo
J. Appl. Phys., 104, 094911 (2008) Curto_jap_otto_2008
2007
Collective working regimes for coupled heat engines
B. Jiménez de Cisneros and A. Calvo Hernández
Phys. Rev. Letters, 98, 130602-1-4 (2007) A.Calvo_PRL_collective_2007
2006
Linear irreversible thermodynamics and coefficient of performance
B. Jiménez de Cisneros, L. A. Arias-Hernández, and A. Calvo Hernández
Phys. Rev. E, 73, 057103-1-4 (2006) A.Calvo_PRE_TPI_2006
2004
Harmonic quantum heat devices: optimum-performance regimes
N. Sánchez Salas and A. Calvo Hernández
Phys. Rev. E, 70, 046134-1-6 (2004) A.Calvo_PRE_quantum_2004
