Spectroscopic Study of the Forbidden Lines [OIII] and [SII] of Crab Nebula Supernova Remnant. Iraqi Journal of Science [Internet]. 2025 Mar. 7 [cited 2025 Jul. 19];56(4c):3564-8. Available from: https://www.ijs.uobaghdad.edu.iq/index.php/eijs/article/view/15239