Dubrovka, Fedir F.Piltyay, Stepan I.2015-01-142015-01-142014Dubrovka Fedir F. Boundary problem solution for eigenmodes in coaxial quad-ridged waveguides / Fedir F. Dubrovka, Stepan I. Piltyay // Information and telecommunication sciences : international research journal. – 2014. – Vol. 5, N. 1(8). – Pp. 48–61. – Bibliogr.: 26 ref.https://ela.kpi.ua/handle/123456789/10097enBoundary problem solution for eigenmodes in coaxial quad-ridged waveguidesArticlePp. 48-61621.396