%0 Journal Article %A V. E. Plisko %T Some variants of the notion of realizability for predicate formulas %J Izvestiya. Mathematics %D 1978 %P 588-604 %V 12 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/IM2_1978_12_3_a9/ %G en %F IM2_1978_12_3_a9