cycle
1987 / Thermal efficiency at maximum work output: New results for old heat engines / Harvey S. Leff / American Journal of Physics 55 (1987) p. 602 [doi]
2000 / Les cycles dithermes à l'épreuve du temps / François Petitet / Bulletin de l'Union des Physiciens 824 (2000) p. 917 [lien]
2016 / Not all counterclockwise thermodynamic cycles are refrigerators / R. H. Dickerson ; J. Mottmann / American Journal of Physics 84 (2016) p. 413 [doi]