Klaus Ambos-Spies. Cupping and noncapping in the r.e. weak truth table and turing degrees. Arch. Math. Log., 25(1):109-126, 1985. [doi]
@article{Ambos-Spies85-1,
title = {Cupping and noncapping in the r.e. weak truth table and turing degrees},
author = {Klaus Ambos-Spies},
year = {1985},
doi = {10.1007/BF02007561},
url = {http://dx.doi.org/10.1007/BF02007561},
researchr = {https://researchr.org/publication/Ambos-Spies85-1},
cites = {0},
citedby = {0},
journal = {Arch. Math. Log.},
volume = {25},
number = {1},
pages = {109-126},
}