Nanjo,K.; Sekija,M.
Chemical and Pharmaceutical Bulletin, 1979 , vol. 27, p. 198 - 203

Yamamoto, Makoto; Suzuki, Kazuya; Tanaka, Seiji; Yamada, Kazutoshi
Bulletin of the Chemical Society of Japan, 1987 , vol. 60, # 4 p. 1523 - 1524