Geodesic
Hyperhypersimple $m$-degrees
Algebra i logika, Tome 8 (1969) no. 5, pp. 523-552.

Voir la notice de l'article provenant de la source Math-Net.Ru

@article{AL_1969_8_5_a1,
     author = {Yu. L. Ershov},
     title = {Hyperhypersimple $m$-degrees},
     journal = {Algebra i logika},
     pages = {523--552},
     publisher = {mathdoc},
     volume = {8},
     number = {5},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1969_8_5_a1/}
}
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Yu. L. Ershov. Hyperhypersimple $m$-degrees. Algebra i logika, Tome 8 (1969) no. 5, pp. 523-552. http://geodesic.mathdoc.fr/item/AL_1969_8_5_a1/