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@article{AL_1964_3_5_a2, author = {V. F. Kostyrko}, title = {The reduction-class $\forall \exists ^n\forall $}, journal = {Algebra i logika}, pages = {45--55}, publisher = {mathdoc}, volume = {3}, number = {5}, year = {1964}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AL_1964_3_5_a2/} }
V. F. Kostyrko. The reduction-class $\forall \exists ^n\forall $. Algebra i logika, Tome 3 (1964) no. 5, pp. 45-55. http://geodesic.mathdoc.fr/item/AL_1964_3_5_a2/