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@article{AL_1963_2_1_a0, author = {I. A. Lavrov}, title = {The effective non-separability of the set of identically true}, journal = {Algebra i logika}, pages = {5--18}, publisher = {mathdoc}, volume = {2}, number = {1}, year = {1963}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AL_1963_2_1_a0/} }
I. A. Lavrov. The effective non-separability of the set of identically true. Algebra i logika, Tome 2 (1963) no. 1, pp. 5-18. http://geodesic.mathdoc.fr/item/AL_1963_2_1_a0/