by Zilko, J.L., Segner, B.P., Chakrabarti, U.K., Logan, R.A., Lopata, J., Van Haren, D.L., Long, J.A.
Published in Journal of crystal growth (02.02.1991)

by Zilko, J.L., Ketelsen, L.J.P., Twu, Y., Wilt, D.P., Napoltz, S.G., Blaha, J.P., Strege, K.E., Riggs, V.G., Van Haren, D.L., Leung, S.Y., Nitzche, P.M., Long, J.A., Roxlo, C.B., Przyblek, G., Lopata, J., Focht, M.W., Koszi, J.
Published in IEEE journal of quantum electronics (01.10.1989)

by McCrary, V.R., Van Haren, D.L., Zilko, J.L., Blaha, J., Slusky, S.E.G., Lee, J.W., Chu, S.N.G., Thomas, P., Swaminathan, V.
Published in Journal of crystal growth (01.05.1991)