1. Arslanov, M.: On some generalizations of a fixed point theorem. Izv. Vyssh. Uchebn. Zaved. Mat. (5), 9–16 (1981)
2. Cai, M.: Array nonrecursiveness and relative recursive enumerbility. To appear in the Journal of Symbolic Logic
3. Cai, M., Shore, R.A.: Domination, forcing, array nonrecursiveness and relative recursive enumerablity. To appear in the Journal of Symbolic Logic
4. Downey, R., Jockusch, C., Stob, M.: Array nonrecursive degrees and genericity. London Mathematical Society Lecture Notes Series, vol. 224, pp. 93–105. University Press (1996)
5. Ishmukhametov, S.: Weak recursive degrees and a problem of Spector. In: Arslanov, Lempp (eds.) Recursion Theory and Complexity, de Gruyter, pp. 81–89 (1999)