@article{02129197,
title = {On equivalence question between the Ditzian-Totik modulus of smoothness and an usual periodic modulus of smoothness.},
journal = {General Mathematics},
volume = {6},
year = {1998},
pages = {13-14},
zbl = {1052.41502},
language = {en},
url = {http://dml.mathdoc.fr/item/02129197}
}
Gal, Sorin. On equivalence question between the Ditzian-Totik modulus of smoothness and an usual periodic modulus of smoothness.. General Mathematics, Tome 6 (1998) pp. 13-14. http://gdmltest.u-ga.fr/item/02129197/