@article{1183739737,
author = {Chong, C. T.},
title = {Minimal Upper Bounds for Ascending Sequences of $\alpha$-Recursively Enumerable Degrees},
journal = {J. Symbolic Logic},
volume = {41},
number = {1},
year = {1976},
pages = { 250-260},
language = {en},
url = {http://dml.mathdoc.fr/item/1183739737}
}
Chong, C. T. Minimal Upper Bounds for Ascending Sequences of $\alpha$-Recursively Enumerable Degrees. J. Symbolic Logic, Tome 41 (1976) no. 1, pp. 250-260. http://gdmltest.u-ga.fr/item/1183739737/