Mushtaq, M., Tan, I. M., Sagir, M., Suleman Tahir, M. and Pervaiz, M. (2016) “A novel hybrid catalyst for the esterification of high FFA in Jatropha oil for biodiesel production”, Grasas y Aceites, 67(3), p. e150. doi: 10.3989/gya.0216161.