The roots of polynomials and the operator $$ Delta _i^3$$ on the Hahn sequence space h. - Eberhard Malkowsky; Gradimir V. Milovanovic; Vladimir Rakocevic; Orhan Tug (Comput. Appl. Math., 2021)

On the Double Sequence Space Hϑ as an Extension of Hahn Space h. - Orhan Tug; Eberhard Malkowsky; Vladimir Rakocevic; Taja Yaying (Int. J. Math. Math. Sci., 2025)