@article{GDZPPN002172607,
title = {An approximate functional equation with applications to a problem of Diophantine approximation.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {169},
year = {1933},
pages = {219-237},
zbl = {0007.05604},
url = {http://dml.mathdoc.fr/item/GDZPPN002172607}
}
Wilton, J.R. An approximate functional equation with applications to a problem of Diophantine approximation.. Journal für die reine und angewandte Mathematik, Tome 169 (1933) pp. 219-237. http://gdmltest.u-ga.fr/item/GDZPPN002172607/