Klaus Ambos-Spies, Philipp Bodewig, Yun Fan, Thorsten Kräling. The partial orderings of the computably enumerable ibT-degrees and cl-degrees are not elementarily equivalent. Annals of Pure and Applied Logic, 164(5):577-588, 2013. [doi]
@article{Ambos-SpiesBFK13,
title = {The partial orderings of the computably enumerable ibT-degrees and cl-degrees are not elementarily equivalent},
author = {Klaus Ambos-Spies and Philipp Bodewig and Yun Fan and Thorsten Kräling},
year = {2013},
doi = {10.1016/j.apal.2012.11.002},
url = {http://dx.doi.org/10.1016/j.apal.2012.11.002},
researchr = {https://researchr.org/publication/Ambos-SpiesBFK13},
cites = {0},
citedby = {0},
journal = {Annals of Pure and Applied Logic},
volume = {164},
number = {5},
pages = {577-588},
}