@article{1183743750,
author = {Takeuti, Gaisi},
title = {A Second Order Version of $S^i\_2$ and $U^1\_2$},
journal = {J. Symbolic Logic},
volume = {56},
number = {1},
year = {1991},
pages = { 1038-1063},
language = {en},
url = {http://dml.mathdoc.fr/item/1183743750}
}
Takeuti, Gaisi. A Second Order Version of $S^i_2$ and $U^1_2$. J. Symbolic Logic, Tome 56 (1991) no. 1, pp. 1038-1063. http://gdmltest.u-ga.fr/item/1183743750/