1. M. Kawata, M. Yukinobu, U.S. patent No. 5662962, 2 Sep. 1997
2. K. Adachi, A. Yamanaka, A. Toufuku, S. Iida, M. Yukinobu, K. Orita, H. Inage, H. Takeda, U.S. patent No. 5853869, 29 Dec. 1998
3. J.P. Cronin, A. Agrawal, M. Trosky, U.S. patent No. 5900275, 4 May. 1999
4. A. Toufuku, K. Adachi, U.S. patent No. 5,785,897, 28 Jul. 1997
5. Transparent conductors—A status review