@article{00770114,
title = {Some negative results concerning the process of Fej\'er type trigonometric convolution.},
journal = {Georgian Mathematical Journal},
volume = {2},
year = {1995},
pages = {313-322},
doi = {10.1007/BF02261704},
zbl = {0842.42004},
language = {en},
url = {http://dml.mathdoc.fr/item/00770114}
}
Oniani, G. Some negative results concerning the process of Fejér type trigonometric convolution.. Georgian Mathematical Journal, Tome 2 (1995) pp. 313-322. doi : 10.1007/BF02261704. http://gdmltest.u-ga.fr/item/00770114/