%0 Journal Article %A A. N. Degtev %T Partially ordered sets of $1$-degrees that occur in recursively %J Algebra i logika %D 1976 %P 249-266 %V 15 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/AL_1976_15_3_a0/ %G ru %F AL_1976_15_3_a0