@article{GDZPPN002423014, title = {Trigonometric Polynomial Approximation in the L1-Form.}, journal = {Mathematische Zeitschrift}, volume = {166}, year = {1979}, pages = {261-270}, zbl = {0415.41005}, url = {http://dml.mathdoc.fr/item/GDZPPN002423014} }
Peherstorfer, Franz. Trigonometric Polynomial Approximation in the L1-Form.. Mathematische Zeitschrift, Tome 166 (1979) pp. 261-270. http://gdmltest.u-ga.fr/item/GDZPPN002423014/