A criterion for completeness of degrees of unsolvability. Friedberg, R. J. Symb. Logic, 22:159–160, 1957. Paper doi bibtex @ARTICLE{Fri57,
author = {Friedberg, Richard},
title = {A criterion for completeness of degrees of unsolvability},
journal = {J. Symb. Logic},
year = {1957},
volume = {22},
pages = {159--160},
doi = {10.2307/2964177},
file = {Fri57.pdf:Fri57.pdf:PDF},
fjournal = {The Journal of Symbolic Logic},
issn = {0022-4812},
mrclass = {02.00},
mrnumber = {0098025 (20 \#4488)},
mrreviewer = {G. F. Rose},
url = {http://www.jstor.org/stable/2964177}
}
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