TY  - BOOK
AU  - Epstein, Richard L
AU  - 
TI  - Degrees of unsolvability: Structure and theory
T2  - Lecture Notes in Mathematics, No.0759
U1  - R  LNM.0759 
PY  - 1979///
CY  - Springer-Verlag, Berlin
KW  - Lecture Notes in Mathematics
ER  -