Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{CMH_1945__18_138873, author = {Georges Alexits}, title = {Sur la sommation forte des s\'eries orthogonales.}, journal = {Commentarii mathematici Helvetici}, pages = {122--128}, publisher = {mathdoc}, volume = {18}, year = {1945}, zbl = {0060.17004}, url = {http://geodesic.mathdoc.fr/item/CMH_1945__18_138873/} }
Georges Alexits. Sur la sommation forte des séries orthogonales.. Commentarii mathematici Helvetici, Tome 18 (1945), pp. 122-128. http://geodesic.mathdoc.fr/item/CMH_1945__18_138873/