@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/