Vankawala, Pravinchandra J.; Kolla, Naveenkumar; Elati, Chandrashekar R.; Sreenivasulu; Kumar, K. Arun; Anjaneyulu, Yerrimilli; Venkatraman, Sundaram; Bhattacharya, Apurba; Mathad, Vijayavitthal T. Synthetic Communications, 2007 , vol. 37, # 19 p. 3439 - 3446