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@article{MZM_1986_39_2_a11, author = {S. S. Marchenkov}, title = {Existence of superposition bases in countable primitively recursively closed classes}, journal = {Matemati\v{c}eskie zametki}, pages = {268--276}, publisher = {mathdoc}, volume = {39}, number = {2}, year = {1986}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1986_39_2_a11/} }
S. S. Marchenkov. Existence of superposition bases in countable primitively recursively closed classes. Matematičeskie zametki, Tome 39 (1986) no. 2, pp. 268-276. http://geodesic.mathdoc.fr/item/MZM_1986_39_2_a11/