@article{bwmeta1.element.bwnjournal-article-doi-10_4064-aa128-4-5,
author = {Peter Borwein and Tam\'as Erd\'elyi},
title = {Lower bounds for the number of zeros of cosine polynomials in the period: a problem of Littlewood},
journal = {Acta Arithmetica},
volume = {130},
year = {2007},
pages = {377-384},
zbl = {1124.41009},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-aa128-4-5}
}
Peter Borwein; Tamás Erdélyi. Lower bounds for the number of zeros of cosine polynomials in the period: a problem of Littlewood. Acta Arithmetica, Tome 130 (2007) pp. 377-384. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-aa128-4-5/