@article{IVM_1979_12_a1,
     author = {I. E. Benenson},
     title = {The structure of quasivarieties of models},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {14--20},
     publisher = {mathdoc},
     number = {12},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1979_12_a1/}
}