Chemical Research Institute of Non-aqueous Solutions, Tohoku University, Katahira 2-1-1, Sendai 980, Japan Spectroscopic Co., Ltd., Ishikawa-cho 2967, Hachioji, Tokyo 192, and Matsushita Research Institute Tokyo, Ikuta 4896, Tama-ku, Kawasaki 214, Japan(1981-09-01時点)
