Trebels, Walter ; Westphal, Ursula (2005)
K-functionals related to semigroups of operators.
In: Rendiconti del circolo matematico di Palermo : Series 2, (Suppl.)
Article, Bibliographie

Gogatishvili, Amiran ; Opic, Bohumir ; Trebels, Walter (2005)
Limiting reiteration for real interpolation with slowly varying functions.
In: Mathematische Nachrichten, 278
Article, Bibliographie

Trebels, Walter ; Belinsky, E. (2004)
Generalized Liouville differentiation, truncated hypersingular integrals and K-functionals.
In: Mathematische Zeitschrift, 246
Article, Bibliographie

Trebels, Walter ; Westphal, U. (2003)
Characterizations of K-functionals built from fractional powers of infinitesimal generators of semigroups.
In: Constructive Approximation, 19
Article, Bibliographie

Trebels, Walter ; Westphal, U. (2003)
K-functionals on L1(Rn) related to the Laplacian.
In: Contemporary Mathematics, 320
Article, Bibliographie

Opic, Bohumir ; Trebels, Walter (2003)
Sharp embeddings of Bessel potential spaces with logarithmic smoothness.
Conference or Workshop Item, Bibliographie

Kryakin, Yuri ; Trebels, Walter (2002)
q-Moduli of continuity in H P(D), p > 0, and an inequality of Hardy and Littlewood.
In: Journal of approximation theory, 115
Article, Bibliographie

Trebels, Walter ; Stokolos, A. M. (1999)
Equivalence of a K-functional with the approximation behaviour of some linear means for abstract Fourier series.
Conference or Workshop Item, Bibliographie

Stokolos, A. M. ; Trebels, Walter (1999)
On the rate of almost everywhere convergence of certain integral means. Part I: Periodical case.
In: Journal of approximation theory. 98 (1999), S. 203-222
Article, Bibliographie

Kamaly, A. ; Stokolos, A. M. ; Trebels, Walter (1999)
On the rate of almost everywhere convergence of certain integral means. Part II.
In: Journal of approximation theory. 101 (1999), S. 240-262
Article, Bibliographie