TY  - JOUR
AU  - JR., Carl G. Jockusch
TI  - Simple Proofs of Some Theorems on High Degrees of Unsolvability
JO  - Canadian journal of mathematics
PY  - 1977
SP  - 1072
EP  - 1080
VL  - 29
IS  - 5
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CJM-1977-105-5/
DO  - 10.4153/CJM-1977-105-5
ID  - 10_4153_CJM_1977_105_5
ER  -