I.T.Abed-Ali, and C.A.Emshary. “Determination of Nonlinear Refractive Index of Paprika Oil and Pepper Oil under Cw Visible Laser Illumination ”. University of Thi-Qar Journal, vol. 12, no. 3, Apr. 2019, pp. 90-101, https://www.jutq.utq.edu.iq/index.php/main/article/view/103.