@inproceedings{Lipari:2021yJ, author = "Lipari, Paolo", title = "{How well do we understand the properties of the Galactic cosmic ray accelerators and of cosmic ray propagation in the Galaxy ? A critical view.}", doi = "10.22323/1.395.0169", booktitle = "Proceedings of 37th International Cosmic Ray Conference {\textemdash} PoS(ICRC2021)", year = 2021, volume = "395", pages = "169" }