KARPUKOV, L. M.; KOROLKOV, R. Y. Synthesis microwave loop filters of low frequencies on function of the filtration. Electrical Engineering and Power Engineering, [S. l.], n. 1, p. 53–56, 2010. DOI: 10.15588/1607-6761-2010-1-7. Disponível em: http://ee.zntu.edu.ua/article/view/93980. Acesso em: 3 may. 2024.