@article{AL_1989_28_5_a5,
     author = {T. M. Kuz'mina},
     title = {Generalized semilattices and ${\rm m}$-degrees of index},
     journal = {Algebra i logika},
     pages = {555--569},
     publisher = {mathdoc},
     volume = {28},
     number = {5},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1989_28_5_a5/}
}