1. Hu Jigao, Reports, 3rd International Symposium on the Conservation and Restoration of Cultural Property-Conservation of Far East Art Objects(1979, Tokyo),84
2. Y. Yamauchi and J. Kumanotani, 28th IUPAC (Vancouver, Canada) 1981, OR 30.
3. R. Majima, Ber., 55:172(1920); J. Kumanotani, Makromol. Chem., 179:172(1978) and literature 4.
4. W. F. Smyes, C. R. Dawson, J. Am. Chem. Soc., 76: 2959, 5070 (1954)
5. J. Kumanotani, M. Achiwa, R. Oshima,and K. Adachi, Proc. 2nd ISCR- CP, Cultrual Property and Analytical Chemistry, 51(1979)