@article{AL_1992_31_1_a1,
     author = {N. Kh. Kasymov},
     title = {Positive algebras with countable congruence lattices},
     journal = {Algebra i logika},
     pages = {21--37},
     publisher = {mathdoc},
     volume = {31},
     number = {1},
     year = {1992},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1992_31_1_a1/}
}