@article{PPN243919689_0238+dmdlog17,
title = {On a conjecture of R.M. Robinson about sums of roots of unity.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {238},
year = {1969},
pages = {112-131},
zbl = {0179.35203},
url = {http://dml.mathdoc.fr/item/PPN243919689_0238+dmdlog17}
}
Cassels, J.W.S. On a conjecture of R.M. Robinson about sums of roots of unity.. Journal für die reine und angewandte Mathematik, Tome 238 (1969) pp. 112-131. http://gdmltest.u-ga.fr/item/PPN243919689_0238+dmdlog17/