Geodesic
The $\Sigma $-enumeration principle
Doklady Akademii Nauk, Tome 270 (1983) no. 4, pp. 786-788.

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     author = {Yu. L. Ershov},
     title = {The $\Sigma $-enumeration principle},
     journal = {Doklady Akademii Nauk},
     pages = {786--788},
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     number = {4},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1983_270_4_a2/}
}
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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/