Akpinar Borazan, A., C. Acikgoz, and E. M. Andoglu. “A Case Study of Effective Factors on the Right Industrial Lubricating Oil Choosing”. Journal of Engineering Research and Applied Science, Vol. 2, no. 2, Jan. 2014, pp. 167-83, http://journaleras.com/index.php/jeras/article/view/28.