STANKUS, Eugenijus. On the divisor sums in arithmetical progressions. Lietuvos matematikos rinkinys, [S. l.], v. 38, n. II, p. 76–79 , 1998. DOI: 10.15388/LMD.1998.37710. Disponível em: https://www.journals.vu.lt/LMR/article/view/37710. Acesso em: 5 dec. 2025.