@article{1183741134,
author = {Schmerl, Ulf R.},
title = {Iterated Reflection Principles and the $\omega$-Rule},
journal = {J. Symbolic Logic},
volume = {47},
number = {1},
year = {1982},
pages = { 721-733},
language = {en},
url = {http://dml.mathdoc.fr/item/1183741134}
}
Schmerl, Ulf R. Iterated Reflection Principles and the $\omega$-Rule. J. Symbolic Logic, Tome 47 (1982) no. 1, pp. 721-733. http://gdmltest.u-ga.fr/item/1183741134/