@article{1077490049, author = {John, Fritz}, title = {Polar correspondence with respect to a convex region}, journal = {Duke Math. J.}, volume = {3}, number = {1}, year = {1937}, pages = { 355-369}, language = {en}, url = {http://dml.mathdoc.fr/item/1077490049} }
John, Fritz. Polar correspondence with respect to a convex region. Duke Math. J., Tome 3 (1937) no. 1, pp. 355-369. http://gdmltest.u-ga.fr/item/1077490049/