Oh, Chang-Hyun; Lee, Su-Chul; Lee, Ki-Soo; Woo, Eun-Rhan; Hong, Chang Yong; Yang, Boem-Seok; Baek, Dae Jin; Cho, Jung-Hyuck Archiv der Pharmazie, 1999 , vol. 332, # 6 p. 187 - 190