E. Zikkos, “On complete Riesz–Fischer sequences in a Hilbert space”, Probl. Anal. Issues Anal., 13(31):1 (2024), 124–131
2020
2.
Elias Zikkos, “Moment problems in weighted $L^2$ spaces on the real line”, Ural Math. J., 6:1 (2020), 168–175
2018
3.
E. Zikkos, “A Taylor–Dirichlet series with no singularities on its abscissa of convergence”, Ufimsk. Mat. Zh., 10:3 (2018), 146–152; Ufa Math. J., 10:3 (2018), 142–148