%0 Journal Article %A A. V. Kuznetsov %T Analogs of the “Sheffer stroke” in constructive logic %J Doklady Akademii Nauk %D 1965 %P 274-277 %V 160 %N 2 %U http://geodesic.mathdoc.fr/item/DAN_1965_160_2_a5/ %G ru %F DAN_1965_160_2_a5