Voir la notice de l'article provenant de la source Math-Net.Ru
@article{MZM_2006_80_6_a11, author = {V. I. Ivanov}, title = {On the {Tur\'an} and {Delsarte} problems for periodic positive definite functions}, journal = {Matemati\v{c}eskie zametki}, pages = {934--939}, publisher = {mathdoc}, volume = {80}, number = {6}, year = {2006}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_2006_80_6_a11/} }
V. I. Ivanov. On the Tur\'an and Delsarte problems for periodic positive definite functions. Matematičeskie zametki, Tome 80 (2006) no. 6, pp. 934-939. http://geodesic.mathdoc.fr/item/MZM_2006_80_6_a11/