JANKAUSKAS, Z.; KVEDARAS, V.; ZAVECKAS, V. The Investigation of Helicon Maser. Elektronika ir Elektrotechnika, [S. l.], v. 59, n. 3, 2005. Disponível em: https://eejournal.ktu.lt/index.php/elt/article/view/10399. Acesso em: 25 sep. 2020.