Geodesic
On elementary theories of semilattices of $n$-recursively enumerable degrees with respect to enumerability
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 4 (2001), pp. 24-27.

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I. Sh. Kalimullin. On elementary theories of semilattices of $n$-recursively enumerable degrees with respect to enumerability. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 4 (2001), pp. 24-27. http://geodesic.mathdoc.fr/item/IVM_2001_4_a3/

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