@article{AIHPA_1975__22_2_143_0,
     author = {Beltman, J. M.},
     title = {Thermodynamic equivalence of spin systems},
     journal = {Annales de l'institut Henri Poincar\'e. Section A, Physique Th\'eorique},
     pages = {143--158},
     publisher = {Gauthier-Villars},
     volume = {22},
     number = {2},
     year = {1975},
     mrnumber = {384022},
     language = {en},
     url = {http://www.numdam.org/item/AIHPA_1975__22_2_143_0/}
}