Štaras, S., and A. Katkevičius. “Properties of Helical Structures Containing Periodical Inhomogeneities”. Elektronika ir Elektrotechnika 99, no. 3 (March 2, 2010): 49-52. Accessed April 24, 2024. https://eejournal.ktu.lt/index.php/elt/article/view/9904.