Working Paper
                        
                        Sen, Parveen, Arun  Bhargava, Ronnie  George, V S Ramesh, Arvind  Hemamalini, Raju  Prema, Govindasamy  Kumaramanickavel, and Lingam  Vijaya.  
"Prevalence of retinitis pigmentosa in South Indian population aged above 40 years." Ophthalmic epidemiology 15, no. 4 (2008): 279-281.