Buzas,F. et al.
Chimica Therapeutica, 1972 , vol. 7, p. 398 - 403

Imamura, Shinichi; Ishihara, Yuji; Hattori, Taeko; Kurasawa, Osamu; Matsushita, Yoshihiro; Sugihara, Yoshihiro; Kanzaki, Naoyuki; Iizawa, Yuji; Baba, Masanori; Hashiguchi, Shohei Chemical and Pharmaceutical Bulletin, 2004 ,  vol. 52,  # 1  p. 63 - 73