%0 Journal Article %A V. N. Ryzhov %A E. E. Tareeva %A T. I. Shchelkacheva %T Orientational ordering in molecular hydrogen.~IV. Phase transition of the second kind in the hexagonal lattice %J Teoretičeskaâ i matematičeskaâ fizika %D 1979 %P 269-274 %V 40 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/TMF_1979_40_2_a8/ %G ru %F TMF_1979_40_2_a8