@article{1077490341, author = {Hill, J. D.}, title = {On perfect methods of summability}, journal = {Duke Math. J.}, volume = {3}, number = {1}, year = {1937}, pages = { 702-714}, language = {en}, url = {http://dml.mathdoc.fr/item/1077490341} }
Hill, J. D. On perfect methods of summability. Duke Math. J., Tome 3 (1937) no. 1, pp. 702-714. http://gdmltest.u-ga.fr/item/1077490341/