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@article{AL_1993_32_1_a3, author = {Yu. G. Ventsov}, title = {Effective selection operations on constructive and positive}, journal = {Algebra i logika}, pages = {45--53}, publisher = {mathdoc}, volume = {32}, number = {1}, year = {1993}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AL_1993_32_1_a3/} }
Yu. G. Ventsov. Effective selection operations on constructive and positive. Algebra i logika, Tome 32 (1993) no. 1, pp. 45-53. http://geodesic.mathdoc.fr/item/AL_1993_32_1_a3/