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@article{AL_1991_30_6_a4, author = {A. I. Omarov}, title = {Filtering formulas}, journal = {Algebra i logika}, pages = {693--704}, publisher = {mathdoc}, volume = {30}, number = {6}, year = {1991}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AL_1991_30_6_a4/} }
A. I. Omarov. Filtering formulas. Algebra i logika, Tome 30 (1991) no. 6, pp. 693-704. http://geodesic.mathdoc.fr/item/AL_1991_30_6_a4/