@article{1077475368, author = {Pollard, Harry}, title = {The mean convergence of orthogonal series. III}, journal = {Duke Math. J.}, volume = {16}, number = {1}, year = {1949}, pages = { 189-191}, language = {en}, url = {http://dml.mathdoc.fr/item/1077475368} }
Pollard, Harry. The mean convergence of orthogonal series. III. Duke Math. J., Tome 16 (1949) no. 1, pp. 189-191. http://gdmltest.u-ga.fr/item/1077475368/