1. M. Przybylska and L. Marion, Can. J. Chem.,37, 1843 (1959).
2. V. Skaric and L. Marion, J. Am. Chem. Soc.,80, 4434 (1958).
3. L. Marion, Pure Appl. Chem.,6, 621 (1963).
4. W. Song, H. Li, and D. Chen, Proc. Chin. Acad. Med. Sci. Peking Univ. Med. Coll.,2, 48 (1987).
5. M. S. Yunusov, Ya. V. Rashkes, B. T. Salimov, É. F. Ametova, G. B. Fridlyanskii, Khim. Prir. Soedin., No. 4, 525 (1985).