S. Barry Cooper, Andrea Sorbi, Xiaoding Yi. Cupping and Noncupping in the Enumeration Degrees of Sigma::2:::::0::: Sets. Annals of Pure and Applied Logic, 82(3):317-342, 1996.
@article{CooperSY96,
title = {Cupping and Noncupping in the Enumeration Degrees of Sigma::2:::::0::: Sets},
author = {S. Barry Cooper and Andrea Sorbi and Xiaoding Yi},
year = {1996},
researchr = {https://researchr.org/publication/CooperSY96},
cites = {0},
citedby = {0},
journal = {Annals of Pure and Applied Logic},
volume = {82},
number = {3},
pages = {317-342},
}