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@article{AM2_1997__54_3_137694, author = {M. Felten}, title = {A modulus of smoothness based on an algebraic addition.}, journal = {Aequationes mathematicae}, pages = {56--73}, publisher = {mathdoc}, volume = {54}, number = {3}, year = {1997}, zbl = {0882.41008}, url = {http://geodesic.mathdoc.fr/item/AM2_1997__54_3_137694/} }
M. Felten. A modulus of smoothness based on an algebraic addition.. Aequationes mathematicae, Tome 54 (1997) no. 3, pp. 56-73. http://geodesic.mathdoc.fr/item/AM2_1997__54_3_137694/