Zaitseva; Kvasyuk; Vaaks; Barai; Bokut; Zinchenko; Mikhailopulo
Nucleosides and Nucleotides, 1994 , vol. 13, # 1-3 p. 819 - 834

Kawaguchi; Sakairi; Kimura; Yamaguchi; Saneyoshi
Chemical and Pharmaceutical Bulletin, 1995 , vol. 43, # 3 p. 501 - 504