@article{GDZPPN002264552, title = {On the Summability of Series of Legendre's Functions.}, journal = {Mathematische Annalen}, volume = {71}, year = {1912}, pages = {211-227}, zbl = {43.0551.01}, url = {http://dml.mathdoc.fr/item/GDZPPN002264552} }
Chapman, S. On the Summability of Series of Legendre's Functions.. Mathematische Annalen, Tome 71 (1912) pp. 211-227. http://gdmltest.u-ga.fr/item/GDZPPN002264552/