Equivalence of K-functionals and modulus of smoothness generated by a Dunkl type operator on the interval $(-1,1)$

Faouaz Saadi; Radouan Daher

Comptes Rendus. Mathématique, Volume 361 (2023) p. 1625-1633

Lipschitz Conditions in Damek–Ricci Spaces

Salah El Ouadih; Radouan Daher

Comptes Rendus. Mathématique, Volume 359 (2021) p. 675-685