Angsheng Li, Guohua Wu, Yue Yang. Bounding computably enumerable degrees in the Ershov hierarchy. Annals of Pure and Applied Logic, 141(1-2):79-88, 2006. [doi]
@article{LiWY06:2,
title = {Bounding computably enumerable degrees in the Ershov hierarchy},
author = {Angsheng Li and Guohua Wu and Yue Yang},
year = {2006},
doi = {10.1016/j.apal.2005.10.004},
url = {http://dx.doi.org/10.1016/j.apal.2005.10.004},
researchr = {https://researchr.org/publication/LiWY06%3A2},
cites = {0},
citedby = {0},
journal = {Annals of Pure and Applied Logic},
volume = {141},
number = {1-2},
pages = {79-88},
}