TY  - BOOK
AU  - Sacks,Gerald E.
TI  - Degres of unsolvability
T2  - Annals of mathematics studies
AV  - QA251 S33 1966
PY  - 1966///
CY  - New Yersey : 
PB  - Princeton University, 
KW  - Lemb
KW  - Algebra universal
N1  - Incluye bibliografía
ER  -