Rao, G., A. Raju, C. Rao, and K. Rajulu. “Effect of LPG Content on the Performance and Emissions of A Diesel-LPG Dual-Fuel Engine”. Bangladesh Journal of Scientific and Industrial Research, vol. 46, no. 2, Aug. 2011, pp. 195-00, doi:10.3329/bjsir.v46i2.8186.