Yoshikawa, A.; Nikl, M.; Boulon, G.; Fukuda, T. (2007). "Challenge and study for developing of novel single crystalline optical materials using micro-pulling-down method". Opt. Mater. 30 (1): 6–10. Bibcode:2007OptMa..30....6Y. doi:10.1016/j.optmat.2006.10.030.
Yoshikawa, A.; Nikl, M.; Boulon, G.; Fukuda, T. (2007). "Challenge and study for developing of novel single crystalline optical materials using micro-pulling-down method". Opt. Mater. 30 (1): 6–10. Bibcode:2007OptMa..30....6Y. doi:10.1016/j.optmat.2006.10.030.