KAJACKAS, A.; MINKEVIČIENĖ, J. Application of Radio Technologies in Public Switching Telephone Network. Elektronika ir Elektrotechnika, [S. l.], v. 27, n. 4, 2000. Disponível em: https://eejournal.ktu.lt/index.php/elt/article/view/16862. Acesso em: 26 sep. 2020.