@article{10_4153_CJM_1977_105_5,
     author = {JR., Carl G. Jockusch},
     title = {Simple {Proofs} of {Some} {Theorems} on {High} {Degrees} of {Unsolvability}},
     journal = {Canadian journal of mathematics},
     pages = {1072--1080},
     year = {1977},
     volume = {29},
     number = {5},
     doi = {10.4153/CJM-1977-105-5},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1977-105-5/}
}