@article{00940802, title = {Estimation of the integral modulus of smoothness of an even function of several variables with quasiconvex Fourier coefficients.}, journal = {Georgian Mathematical Journal}, volume = {3}, year = {1996}, pages = {379-400}, doi = {10.1007/BF02256726}, zbl = {0892.42004}, language = {en}, url = {http://dml.mathdoc.fr/item/00940802} }
Tevzadze, T. Estimation of the integral modulus of smoothness of an even function of several variables with quasiconvex Fourier coefficients.. Georgian Mathematical Journal, Tome 3 (1996) pp. 379-400. doi : 10.1007/BF02256726. http://gdmltest.u-ga.fr/item/00940802/