Markus, F. and K. Gambár. "A Variational Principle in Thermodynamics" Journal of Non-Equilibrium Thermodynamics, 16.1 (2009): 27-32. Retrieved 18 Jun. 2013, from doi:10.1515/jnet.1991.16.1.27

Markus, F. & Gambár, K. (2009). A Variational Principle in Thermodynamics. Journal of Non-Equilibrium Thermodynamics, 16(1), pp. 1-87. Retrieved 18 Jun. 2013, from doi:10.1515/jnet.1991.16.1.27

Markus, F. and K. Gambár. 2009. A Variational Principle in Thermodynamics. Journal of Non-Equilibrium Thermodynamics. 16(1): 1-87. Retrieved 18 Jun. 2013, from doi:10.1515/jnet.1991.16.1.27