%0 Journal Article %A N. V. Beljakin %T A variant of Richter's constructive ordinals %J Algebra i logika %D 1969 %P 154-171 %V 8 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/AL_1969_8_2_a1/ %G ru %F AL_1969_8_2_a1