TY  - BOOK
AU  - Epstein,Richard L.
TI  - Degrees of unsolvability: Structure and theory 
T2  - Lecture notes in mathematics / Ed. by A. Dold, B. Eckmann
SN  - 0387097104
U1  - 510/.8 s511/.3 
PY  - 1979///
CY  - Berlin, New York
PB  - Springer-Verlag
KW  - Unsolvability (Mathematical logic)
KW  - Lattices, Distributive
N1  - Includes bibliogr. references and index
ER  -