@article{1178245303, author = {Ohkuma, Tadashi}, title = {On a certain system of orthogonal step functions, I}, journal = {Tohoku Math. J. (2)}, volume = {5}, number = {2}, year = {1953}, pages = { 166-177}, language = {en}, url = {http://dml.mathdoc.fr/item/1178245303} }
Ohkuma, Tadashi. On a certain system of orthogonal step functions, I. Tohoku Math. J. (2), Tome 5 (1953) no. 2, pp. 166-177. http://gdmltest.u-ga.fr/item/1178245303/