1. 2. Barrow W. A. , Tuenge R. T. , and Ziuchkovski M. J. , SID 86 Digest, pp. 25–28, 1986.
2. 3. Yamauchi N. , Kozawaguchi H. , Kogure O. , and Tsujiyama B. , SID 87 Digest, pp. 230–233, 1987.
3. 4. Ohnishi H. , Yamasaki Y. , and Iwase R. , SID 87 Digest, pp. 238–241, 1987.