@article{1077490032, author = {Gergen, J. J.}, title = {Summability of double Fourier series}, journal = {Duke Math. J.}, volume = {3}, number = {1}, year = {1937}, pages = { 133-148}, language = {en}, url = {http://dml.mathdoc.fr/item/1077490032} }
Gergen, J. J. Summability of double Fourier series. Duke Math. J., Tome 3 (1937) no. 1, pp. 133-148. http://gdmltest.u-ga.fr/item/1077490032/