@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/