The Efficiency of Ideal Thermomagnetic Engine
  The article contains calculation of the efficiency of the ideal thermomagnetic engine whose working body is ferromagnetic has been suggested. Suggested method being applicable to any heat engine operating on the basis of structural phase transitions in solid bodies. 
A. G. Kvirikadze, M. D. Zviadadze, V. A. Barnov, G. G. Kiknadze, L. A.   Zamtaradze
cond-mat.other