@article{DM_1990_2_4_a2,
     author = {V. D. Solov'ev},
     title = {Closed classes in $k$-valued logic with an operation of branching by predicates},
     journal = {Diskretnaya Matematika},
     pages = {18--25},
     publisher = {mathdoc},
     volume = {2},
     number = {4},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DM_1990_2_4_a2/}
}