$d$-r.e.\ degrees that are isolated from above.~I
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 2 (1998), pp. 20-28.

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A. A. Efremov. $d$-r.e.\ degrees that are isolated from above.~I. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 2 (1998), pp. 20-28. http://geodesic.mathdoc.fr/item/IVM_1998_2_a3/

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