Prevention of Outbound Unsolicited Electronic Mail. Elektronika ir Elektrotechnika, [S. l.], v. 22, n. 4, p. 63–67, 2016. DOI: 10.5755/j01.eie.22.4.15921. Disponível em: https://eejournal.ktu.lt/index.php/elt/article/view/15921.. Acesso em: 5 dec. 2025.