Venkateswar Reddy, Guvvala; Satish Chandra Kumar, Rotte; Shankaraiah, Gundeti; Suresh Babu, Katragadda; Madhusudana Rao, Janaswamy Helvetica Chimica Acta, 2013, vol. 96, # 8 p. 1590 - 1600 doi: 10.1002/hlca.201200519