Voir la notice de l'article provenant de la source Math-Net.Ru
@article{MZM_2004_75_3_a19, author = {V. A. Yudin}, title = {On {Positive} {Values} of {Spherical} {Harmonics} and {Trigonometric} {Polynomials}}, journal = {Matemati\v{c}eskie zametki}, pages = {476--480}, publisher = {mathdoc}, volume = {75}, number = {3}, year = {2004}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_2004_75_3_a19/} }
V. A. Yudin. On Positive Values of Spherical Harmonics and Trigonometric Polynomials. Matematičeskie zametki, Tome 75 (2004) no. 3, pp. 476-480. http://geodesic.mathdoc.fr/item/MZM_2004_75_3_a19/