@article{AL_1968_7_2_a2,
     author = {S. R. Kogalovskii},
     title = {Compact classes of algebraic systems},
     journal = {Algebra i logika},
     pages = {27--41},
     publisher = {mathdoc},
     volume = {7},
     number = {2},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1968_7_2_a2/}
}