The $\Sigma $-enumeration principle
Doklady Akademii Nauk, Tome 270 (1983) no. 4, pp. 786-788
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@article{DAN_1983_270_4_a2,
author = {Yu. L. Ershov},
title = {The $\Sigma $-enumeration principle},
journal = {Doklady Akademii Nauk},
pages = {786--788},
publisher = {mathdoc},
volume = {270},
number = {4},
year = {1983},
language = {ru},
url = {http://geodesic.mathdoc.fr/item/DAN_1983_270_4_a2/}
}
Yu. L. Ershov. The $\Sigma $-enumeration principle. Doklady Akademii Nauk, Tome 270 (1983) no. 4, pp. 786-788. http://geodesic.mathdoc.fr/item/DAN_1983_270_4_a2/