Geodesic
$d$-r. e. degrees that are isolated from above. II
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 7 (1998), pp. 18-25 
A. A. Efremov. $d$-r. e. degrees that are isolated from above. II. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 7 (1998), pp. 18-25. http://geodesic.mathdoc.fr/item/IVM_1998_7_a2/
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[1] Efremov A. A., “Izolirovannye sverkhu $d$-$p$.$n$. stepeni, I”, Izv. vuzov. Matematika, 1998, no. 2, 20–28 | MR | Zbl

[2] Cooper S. B., Yi X., Isolated d.r.e. degrees, preprint, University of Leeds, 1995 | MR | Zbl

[3] Soare R. I., Recursively enumerable sets and degrees: a study of computable functions and computably generated sets, Springer-Verlag, Berlin, 1987, 437 pp. | MR