@inproceedings{Arsene:2021Db, author = "Arsene, Nicusor", title = "{Fitting fractions of the $X_{\rm max}$ distributions at ultra high energies}", doi = "10.22323/1.395.0193", booktitle = "Proceedings of 37th International Cosmic Ray Conference {\textemdash} PoS(ICRC2021)", year = 2021, volume = "395", pages = "193" }