by Luo, J., Fan, S.J., Xie, H.Q., Xiao, K.C., Qian, S.X., Zhong, Z.W., Qiang, G.X., Sun, R.Y., Xu, J.Y.
Published in Crystal research and technology (1979) (01.11.2001)

by Xiao, K.C., Ogawa, H., Mizuno, A., Fukui, Y.
Published in 2000 IEEE MTT-S International Microwave Symposium Digest (Cat. No.00CH37017) (2000)

by Fukui, Y., Ogawa, H., Xiao, K.C., Iwasaka, Y., Nakane, H., Nagahama, T.
Published in Advances in space research (2000)