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@article{DM_1989_1_2_a8, author = {I. E. Bashtanov}, title = {Types of two-place relations and their preservation classes in three-valued logic}, journal = {Diskretnaya Matematika}, pages = {86--96}, publisher = {mathdoc}, volume = {1}, number = {2}, year = {1989}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DM_1989_1_2_a8/} }
I. E. Bashtanov. Types of two-place relations and their preservation classes in three-valued logic. Diskretnaya Matematika, Tome 1 (1989) no. 2, pp. 86-96. http://geodesic.mathdoc.fr/item/DM_1989_1_2_a8/