Watanabe, Mitsuaki; Kurosaki, Akio; Furukawa, Sunao
Chemical & Pharmaceutical Bulletin, 1984 , vol. 32, # 3 p. 1264 - 1267

Jolivet, Catherine; Rivalle, Christian; Bisagni, Emile
Heterocycles, 1996 , vol. 43, # 5 p. 995 - 1005