@article{AL_1973_12_3_a0,
     author = {A. I. Budkin and V. A. Gorbunov},
     title = {Implicative classes of algebras},
     journal = {Algebra i logika},
     pages = {249--268},
     publisher = {mathdoc},
     volume = {12},
     number = {3},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1973_12_3_a0/}
}