参考文献

Anumula, Raghupathi Reddy; Madivada, Lokeswara Rao; Gilla, Goverdhan; Raju, V. V. N. K. Prasad; Kagga, Mukkanti; Reddy, Padi Pratap; Bhattacharya, Apurba; Bandichhor, Rakeshwar Synthetic Communications, 2008 , vol. 38, # 23 p. 4265 - 4271