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@article{DAN_1974_217_5_a6, author = {A. N. Maslov}, title = {The hierarchy of indexed languages of an arbitrary level}, journal = {Doklady Akademii Nauk}, pages = {1013--1016}, publisher = {mathdoc}, volume = {217}, number = {5}, year = {1974}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1974_217_5_a6/} }
A. N. Maslov. The hierarchy of indexed languages of an arbitrary level. Doklady Akademii Nauk, Tome 217 (1974) no. 5, pp. 1013-1016. http://geodesic.mathdoc.fr/item/DAN_1974_217_5_a6/