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@article{AL_1991_30_2_a1, author = {Yu. M. Vazhenin}, title = {Matrix hierarchies of first-order languages and their}, journal = {Algebra i logika}, pages = {154--167}, publisher = {mathdoc}, volume = {30}, number = {2}, year = {1991}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AL_1991_30_2_a1/} }
Yu. M. Vazhenin. Matrix hierarchies of first-order languages and their. Algebra i logika, Tome 30 (1991) no. 2, pp. 154-167. http://geodesic.mathdoc.fr/item/AL_1991_30_2_a1/