LAURINČIKAS, A. On the Denseness of One Set of Series. Nonlinear Analysis: Modelling and Control, [S. l.], v. 6, n. 1, p. 79–88, 2001. Disponível em: https://www.zurnalai.vu.lt/nonlinear-analysis/article/view/15227. Acesso em: 25 may. 2025.