@article{AL_1988_27_2_a3,
     author = {M. P. Tropin},
     title = {The minimal co-order of {pseudo-Boolean} and {topo-Boolean}},
     journal = {Algebra i logika},
     pages = {201--220},
     publisher = {mathdoc},
     volume = {27},
     number = {2},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1988_27_2_a3/}
}