@article{GDZPPN002042401, title = {A modulus of smoothness based on an algebraic addition.}, journal = {Aequationes mathematicae}, volume = {53}, year = {1997}, pages = {56-73}, zbl = {0882.41008}, url = {http://dml.mathdoc.fr/item/GDZPPN002042401} }
Felten, M. A modulus of smoothness based on an algebraic addition.. Aequationes mathematicae, Tome 53 (1997) pp. 56-73. http://gdmltest.u-ga.fr/item/GDZPPN002042401/