The Schur Lemma for Bounded Multiplier Convergent Series: Charles Swartz (1983) Mathematische Annalen
The space S α , β and σ-core Bruno de Malafosse (2006) Studia Mathematica We give some new properties of the space S α , β and we apply them to the σ-core theory. These results generalize those by Choudhary and Yardimci.
Topological results on sequences { n k x } k = 1 ∞ and their applications in the theory of trigonometric series Zuzana Bukovská, Tibor Šalát (1993) Czechoslovak Mathematical Journal