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@article{MZM_1969_5_5_a8, author = {S. S. Marchenkov}, title = {Elimination of recursion schemas in the {Grzegorczyk} $\mathscr E^2$ class}, journal = {Matemati\v{c}eskie zametki}, pages = {561--568}, publisher = {mathdoc}, volume = {5}, number = {5}, year = {1969}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1969_5_5_a8/} }
S. S. Marchenkov. Elimination of recursion schemas in the Grzegorczyk $\mathscr E^2$ class. Matematičeskie zametki, Tome 5 (1969) no. 5, pp. 561-568. http://geodesic.mathdoc.fr/item/MZM_1969_5_5_a8/