@article{1183743561,
author = {Ahmad, Seema},
title = {Embedding the Diamond in the $\Sigma\_2$ Enumeration Degree},
journal = {J. Symbolic Logic},
volume = {56},
number = {1},
year = {1991},
pages = { 195-212},
language = {en},
url = {http://dml.mathdoc.fr/item/1183743561}
}
Ahmad, Seema. Embedding the Diamond in the $\Sigma_2$ Enumeration Degree. J. Symbolic Logic, Tome 56 (1991) no. 1, pp. 195-212. http://gdmltest.u-ga.fr/item/1183743561/