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@article{DAN_1966_169_5_a1, author = {V. I. Amstislavskii}, title = {Set-theoretic operations and recursive hierarchies}, journal = {Doklady Akademii Nauk}, pages = {995--998}, publisher = {mathdoc}, volume = {169}, number = {5}, year = {1966}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1966_169_5_a1/} }
V. I. Amstislavskii. Set-theoretic operations and recursive hierarchies. Doklady Akademii Nauk, Tome 169 (1966) no. 5, pp. 995-998. http://geodesic.mathdoc.fr/item/DAN_1966_169_5_a1/