by Lacey, R.F., Helgesson, A.L., Holloway, J.H.
Published in Proceedings of the IEEE (1966)

by CHENG DAH YU, A.L. HELGESSON
Year of Publication 01.10.2003

by CHENG DAH YU, A.L. HELGESSON
Year of Publication 26.05.2010

by Ayres, W.P., Vartanian, P.H., Helgesson, A.L.
Published in I.R.E. transactions on microwave theory and techniques (01.04.1958)

by Ku, W.H., Helgesson, A.L., Ross, P.W., Skalnik, J.G.
Published in Proceedings of the IEEE (01.01.1963)

by Rogal, B., Helgesson, A.L., Vartanian, P.H., Ayres, W.P., Matsumaru, K., Morgenthaler, F.R., Helmer, J.C., Cullen, A.L., Milosevic, L., Muller, M.W., Smolarska, J., Collin, R.E., Sucher, M., Sweet, L.O., Brodwin, M.E., Carlin, H.J., Singh, A., Kurokawa, K., James, A.V., Cohn, S.B., Morrison, J.A., Okamura, S., Vautey, R., Engen, G.F., Schiffman, B.M.
Published in I.R.E. transactions on microwave theory and techniques (01.04.1958)