Babu, Karrothu Srihari; Reddy, Mallepalli Srinivasa; Tagore, Amirisetty Ravindranath; Reddy, Gade Srinivas; Sebastian, Sony; Varma, Mudunuru Satish; Venkateswarlu, Gandu; Bhattacharya, Apurba; Reddy, Padi Pratap; Anand, Ramasamy Vijaya Synthetic Communications, 2009 , vol. 39, # 2 p. 291 - 298