A Study on Performance and Emission Characteristics of Diesel Engine Using Ricinus Communis (Castor Oil) Ethyl Esters oleh Munimathan Arunkumar, Vinayagam Mohanavel, Asif Afzal, Thanikodi Sathish, Manickam Ravichandran, Sher Afghan Khan, Nur Azam Abdullah, Muhammad Hanafi Bin Azami, Mohammad Asif