Upadhyaya, Giridhara PM, et al. “Comparative Study Among Clinical and Commensal Isolates of Enterococcus Faecalis for Presence of Esp Gene and Biofilm Production”. The Journal of Infection in Developing Countries, vol. 5, no. 05, Nov. 2010, pp. 365-9, doi:10.3855/jidc.1385.