New Fiber Optic Analog Baseband Transmission Plan for Color TV Signals. - Yoshitaka Takasaki; J. Nakagawa; M. Koya (IEEE Trans. Commun., 1978)

A Hands-Free Mobile Telephone Using Echo Canceller Technique. - M. Koya; N. Tsukamoto; Y. Iwata; K. Shimazu; Y. Fujiwara (ICC, 1986)