@article{AL_1966_5_3_a0,
     author = {A. I. Mal'tsev},
     title = {Several remarks on quasivarieties of algebraic systems},
     journal = {Algebra i logika},
     pages = {3--9},
     publisher = {mathdoc},
     volume = {5},
     number = {3},
     year = {1966},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1966_5_3_a0/}
}