@article{1250126545,
author = {Berman, R.D. and Brown, L. and Cohn, W.S.},
title = {Moduli of continuity and generalized BCH sets},
journal = {Rocky Mountain J. Math.},
volume = {17},
number = {4},
year = {1987},
pages = { 315-338},
language = {en},
url = {http://dml.mathdoc.fr/item/1250126545}
}
Berman, R.D.; Brown, L.; Cohn, W.S. Moduli of continuity and generalized BCH sets. Rocky Mountain J. Math., Tome 17 (1987) no. 4, pp. 315-338. http://gdmltest.u-ga.fr/item/1250126545/