参考文献

Ojwang, Joshua O.; Sudhakar Rao; Marshall, Helene B.; Mustain, Shawn D.; Chaudhary, Nilabh; Walker, David A.; Peyman, Anusch; Uhlmann, Eugen; Revankar, Ganapathi R.; Rando, Robert F. Nucleosides and Nucleotides, 1997 , vol. 16, # 7-9 p. 1703 - 1707