%0 Journal Article %A I. L. Sofronov %T Nondegeneracy of the equations related to the method of difference potentials %J Funkcionalʹnyj analiz i ego priloženiâ %D 1984 %P 94-95 %V 18 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/FAA_1984_18_4_a15/ %G ru %F FAA_1984_18_4_a15