Use of Pyridinium Chlorochromate and Reusable Polyaniline Salt Catalyst Combination for the Oxidation of Indoles - Kumar, Chebolu Naga Sesha Sai Pavan; Devi, Chebrolu Lavanya; Rao, Vaidya Jayathirtha; Palaniappan, Srinivasan (Synlett, 2008)