TY  - BOOK
AU  - Lerman Manuel
TI  - Degrees of unsolvability : local and global theory
SN  - 3-540-12155-2
U1  - 511.3 
PY  - 1983///
CY  - Berlin
PB  - Springer-Verlag
KW  - Mathematical logic
KW  - Unsolvability
ER  -