@article{1178243181, author = {Saeki, Sadahiro}, title = {An elementary proof of a theorem of Henry Helson}, journal = {Tohoku Math. J. (2)}, volume = {20}, number = {4}, year = {1968}, pages = { 244-247}, language = {en}, url = {http://dml.mathdoc.fr/item/1178243181} }
Saeki, Sadahiro. An elementary proof of a theorem of Henry Helson. Tohoku Math. J. (2), Tome 20 (1968) no. 4, pp. 244-247. http://gdmltest.u-ga.fr/item/1178243181/