Behnam Rahimi,Abolfazl Semnani, Alireza Nezamzade Ejhieh , Hamid Shakoori Langeroodi, Mas, Dr.. " Application Of Icp-Oes In The Comparative Analysis Of A Used And Fresh Gasoline Motor Oil." Global Journal of Science Frontier Research [Online], 12.2-B (2012): n. pag. Web. 14 Jul. 2020