@inproceedings{Uchida:2024yu, author = "Uchida, Hiroyuki and Narita, Takuto", title = "{Progenitor constraint using line ratios of the CNO elements in supernova remnants}", doi = "10.22323/1.447.0044", booktitle = "Proceedings of Multifrequency Behaviour of High Energy Cosmic Sources XIV {\textemdash} PoS(MULTIF2023)", year = 2024, volume = "447", pages = "044" }