参考文献

Rao, Somisetti Narender; Sitaramaiah, Devarasetty; Srimannarayana, Kema; Rao, Challa Nageswar; Rao, Peddi Srinivasa; Babu, K. Sudhakar Synthetic Communications, 2011 , vol. 41, # 1 p. 85 - 93