%0 Journal Article
%A JR., Carl G. Jockusch
%T Simple Proofs of Some Theorems on High Degrees of Unsolvability
%J Canadian journal of mathematics
%D 1977
%P 1072-1080
%V 29
%N 5
%U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1977-105-5/
%R 10.4153/CJM-1977-105-5
%F 10_4153_CJM_1977_105_5