Patent

[1]	K. Iwabuchi, T. Kashiwa, H. Naya, I. Fukai, Detector of electric field pattern, No. 2860502. Feb. 1999.
[2]	K. Iwabuchi, T. Kashiwa, H. Naya, I. Fukai, Detector of electric field pattern, No. 2860503. Feb. 1999.