@article{AL_1991_30_2_a2,
     author = {T. M. Kuz'mina},
     title = {Generalized semilattices and $m$-degrees of index {sets.~II}},
     journal = {Algebra i logika},
     pages = {168--180},
     publisher = {mathdoc},
     volume = {30},
     number = {2},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1991_30_2_a2/}
}