by Ying Hu, Jackson, D.R., Williams, J.T., Long, S.A., Komanduri, V.R.
Published in IEEE transactions on antennas and propagation (01.10.2008)

by Komanduri, V.R., Hoorfar, A., Engheta, N.
Published in 2005 IEEE Antennas and Propagation Society International Symposium (2005)