Joanna Jedrzejowicz. Undecidable Problems Associated with Combinatiorial Systems and Their One-One Degrees of Unsolvability. Math. Log. Q., 27(25-30):453-462, 1981. [doi]
@article{Jedrzejowicz81,
title = {Undecidable Problems Associated with Combinatiorial Systems and Their One-One Degrees of Unsolvability},
author = {Joanna Jedrzejowicz},
year = {1981},
doi = {10.1002/malq.19810272508},
url = {http://dx.doi.org/10.1002/malq.19810272508},
researchr = {https://researchr.org/publication/Jedrzejowicz81},
cites = {0},
citedby = {0},
journal = {Math. Log. Q.},
volume = {27},
number = {25-30},
pages = {453-462},
}