1. M. Matsuoka , Functional Dyes and their Application, in Chemistry of Functional Dyes, Vol. 1, ed. Z. Yoshida and Y. Shirota, Mita Press, Tokyo, 1992
2. E. Hideaki , K.Keishi, K.Tsutsui, H.Goto, E.Kawamura, H.Kuboyama, S.Maruyama, I.Sawamura, M.Shimada and T.Yamaguchi, Ricoh Co., Eur. Pat. 0576015, 1994
3. Thermochromism in Commercial Products
4. Textile applications of thennochromic systems