Das, Biswanath; Satyakumar, Avula; Ravikanth, Bommena; Rao, Bommena Vittal; Raju, Tuniki Venugopal; Siddhardha, Busi; Murty, Upadyayula Suryanaryana Journal of Heterocyclic Chemistry, 2013, vol. 50, # 2 p. 430 - 434 doi: 10.1002/jhet.982