Spectroscopic Study of the Forbidden Lines [OIII] and [SII] of Crab Nebula Supernova Remnant. Iraqi Journal of Science, [S. l.], v. 56, n. 4c, p. 3564–3568, 2025. DOI: 10.24996/ijs.2015.56.4c.%g. Disponível em: https://www.ijs.uobaghdad.edu.iq/index.php/eijs/article/view/15239.. Acesso em: 20 jul. 2025.