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