Ibraheem, Aya Khalil, and Abdulrahman H. Salah. “Calculation the Venus Orbital Properties and the Variation of Its Position”. Iraqi Journal of Science 59, no. 4B (November 29, 2018): 2150–2158. Accessed December 10, 2025. https://ijs.uobaghdad.edu.iq/index.php/eijs/article/view/549.