Z. Jankauskas, V. Kvedaras, and V. Zaveckas, “The Investigation of Helicon Maser”, ELEKTRON ELEKTROTECH, vol. 59, no. 3, Mar. 2005, Accessed: Feb. 08, 2026. [Online]. Available: https://eejournal.ktu.lt/index.php/elt/article/view/10399