%0 Journal Article %A T. M. Kuz'mina %T Generalized semilattices and ${\rm m}$-degrees of index %J Algebra i logika %D 1989 %P 555-569 %V 28 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/AL_1989_28_5_a5/ %G ru %F AL_1989_28_5_a5