@article{1028999305, author = {Gundy, Richard F.}, title = {Complete systems in $L\_2$ and a theorem of R\'enyi.}, journal = {Michigan Math. J.}, volume = {12}, number = {1}, year = {1965}, pages = { 161-167}, language = {en}, url = {http://dml.mathdoc.fr/item/1028999305} }
Gundy, Richard F. Complete systems in $L_2$ and a theorem of Rényi.. Michigan Math. J., Tome 12 (1965) no. 1, pp. 161-167. http://gdmltest.u-ga.fr/item/1028999305/