Carl G. Jockusch Jr., Robert I. Soare. Post s Problem and His Hypersimple Set. Journal of Symbolic Logic, 38(3):446-452, 1973.
@article{JockuschS73a, title = {Post s Problem and His Hypersimple Set}, author = {Carl G. Jockusch Jr. and Robert I. Soare}, year = {1973}, researchr = {https://researchr.org/publication/JockuschS73a}, cites = {0}, citedby = {0}, journal = {Journal of Symbolic Logic}, volume = {38}, number = {3}, pages = {446-452}, }