@article{AUPO_1966__7_1_a13,
     author = {Vy\v{s}{\'\i}n, Vratislav and Jank\r{u}, Vladim{\'\i}r},
     title = {Fluctuation in the system with negative absolute temperatures},
     journal = {Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica},
     pages = {167--170},
     publisher = {mathdoc},
     volume = {07},
     number = {1},
     year = {1966},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUPO_1966__7_1_a13/}
}