Kh. Younis, Watfa. “Refractive Index of Oils Measurement by Using Fiber Optics”. Rafidain Journal of Science 17, no. 6 (May 1, 2006): 11–21. Accessed September 29, 2025. https://jwups.uomosul.edu.iq/index.php/rsci/article/view/47322.