@article{AL_1975_14_2_a0,
     author = {A. I. Budkin and V. A. Gorbunov},
     title = {On the theory of quasivarieties of algebraic systems},
     journal = {Algebra i logika},
     pages = {123--142},
     publisher = {mathdoc},
     volume = {14},
     number = {2},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1975_14_2_a0/}
}