%0 Journal Article %A M. G. Kuz'min %T ``Negative temperatures'' in reversible photochemical reactions %J Doklady Akademii Nauk %D 1963 %P 1371-1374 %V 151 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1963_151_6_a38/ %G ru %F DAN_1963_151_6_a38