参考文献

Doores, Katie J.; Fulton, Zara; Hong, Vu; Patel, Mitul K.; Scanlan, Christopher N.; Wormald, Mark R.; Finn; Burton, Dennis R.; Wilson, Ian A.; Davis, Benjamin G. Proceedings of the National Academy of Sciences of the United States of America, 2010 , vol. 107, # 40 p. 17107 - 17112