@article{IVM_1993_1_a2,
     author = {Sh. T. Ishmukhametov},
     title = {On the distributivity of upper semilattices of degrees lower than~$0'$},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {17--20},
     year = {1993},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1993_1_a2/}
}