@article{AL_1992_31_3_a2,
     author = {N. Kh. Kasymov},
     title = {On the number of $Q$-congruences of positive algebras},
     journal = {Algebra i logika},
     pages = {297--305},
     year = {1992},
     volume = {31},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1992_31_3_a2/}
}