Yamauchi, Takayoshi; Nakao, Kenji; Fujii, Kyoichi
Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999), 1987 , p. 1255 - 1258

Castaldi, Graziano; Giordano, Claudio; Uggeri, Fulvio
Synthesis, 1985 , # 5 p. 505 - 506

BLASCHIM S.p.A.
Patent: EP34871 B2, 1993 ;