Kitano, Tomoko; Shirai, Naohiro; Motoi, Manami; Sato, Yoshiro
Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999), 1992 , # 21 p. 2851 - 2854

Cassella Aktiengesellschaft
Patent: US4598079 A1, 1986 ;