Khalaf, S . Z . “Determination of Some Characteristics of comet’s Gases by Photometry Method for Comet Hyakutake”. Iraqi Journal of Physics 14, no. 29 (February 3, 2019): 175–181. Accessed December 19, 2024. https://ijp.uobaghdad.edu.iq/index.php/physics/article/view/233.