Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{ARM_1976__12_1_a1, author = {Karpe, Robert}, title = {\"Uber gewisse {Zerlegung} einer {Funktion} $f(x)$ in $n$ trigonometrische {Reihen;} $n\geq 3$}, journal = {Archivum mathematicum}, pages = {9--14}, publisher = {mathdoc}, volume = {12}, number = {1}, year = {1976}, mrnumber = {0430656}, zbl = {0397.42020}, language = {ge}, url = {http://geodesic.mathdoc.fr/item/ARM_1976__12_1_a1/} }
Karpe, Robert. Über gewisse Zerlegung einer Funktion $f(x)$ in $n$ trigonometrische Reihen; $n\geq 3$. Archivum mathematicum, Tome 12 (1976) no. 1, pp. 9-14. http://geodesic.mathdoc.fr/item/ARM_1976__12_1_a1/