@article{1077489650, author = {Levinson, Norman}, title = {On the closure of $\{e^{i\lambda\_nx}\}$}, journal = {Duke Math. J.}, volume = {2}, number = {1}, year = {1936}, pages = { 511-516}, language = {en}, url = {http://dml.mathdoc.fr/item/1077489650} }
Levinson, Norman. On the closure of $\{e^{i\lambda_nx}\}$. Duke Math. J., Tome 2 (1936) no. 1, pp. 511-516. http://gdmltest.u-ga.fr/item/1077489650/