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@article{MAN_1923__90_159014, author = {J.L. Walsh}, title = {A property of {Haar's} system of orthogonal functions.}, journal = {Mathematische Annalen}, pages = {38--45}, publisher = {mathdoc}, volume = {90}, year = {1923}, zbl = {49.0293.02}, url = {http://geodesic.mathdoc.fr/item/MAN_1923__90_159014/} }
J.L. Walsh. A property of Haar's system of orthogonal functions.. Mathematische Annalen, Tome 90 (1923), pp. 38-45. http://geodesic.mathdoc.fr/item/MAN_1923__90_159014/