%0 Journal Article %A E. M. Aver'yanov %A K. S. Aleksandrov %A V. F. Shabanov %T Change in the internal field anisotropy at phase transition and the order parameter exact determination by the optical methods %J Doklady Akademii Nauk %D 1978 %P 84-86 %V 242 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1978_242_1_a20/ %G ru %F DAN_1978_242_1_a20