[[1] A. Ikesue, T. Kinoshita, K. Kamata, and K. Yoshida, J. Am. Ceram. Soc., 78 (1995) 1033.10.1111/j.1151-2916.1995.tb08433.x]Search in Google Scholar
[[2] D. Alderighi, A. Pirri, Guido Toci, M. Vannini, L. Esposito, A. Luisa Costa, A. Piancastelli, M. Serantoni, Opt. Mater., 33 (2010) 205.]Search in Google Scholar
[[3] T. Yanagitani, H. Yagi, M. Ichikawa, Japanese Patent No. 10-101333 (1998).]Search in Google Scholar
[[4] T. Yanagitani, H. Yagi, Y. Yamasaki, Japanese Patent No. 10-101411 (1998).]Search in Google Scholar
