MERONEN, Olga; TAMMERAID, Ivar. Several theorems on λ–summable series. Mathematical Modelling and Analysis, [S. l.], v. 15, n. 1, p. 97–102, 2010. DOI: 10.3846/1392-6292.2010.15.97-102. Disponível em: https://journals.vilniustech.lt/index.php/MMA/article/view/5975. Acesso em: 9 may. 2025.