Deshmukh, S. , Bhuyar, L. , Thakre, S. , Ingole, S.. "Mathematical Correlation for Brake Thermal Efficiency and NOx Emission of CI Engine using Ester of Vegetable Oils". World Academy of Science, Engineering and Technology, Open Science Index 27, International Journal of Mechanical and Mechatronics Engineering, (2009), 3(3), 301 - 306.