@article{Gabici:2021E1, author = "Gabici, Stefano and Recchia, Sarah and Aharonian, Felix and Niro, Viviana", title = "{Giant cosmic ray halos around M31 and the Milky Way}", doi = "10.22323/1.395.0683", journal = "PoS", year = 2021, volume = "ICRC2021", pages = "683" }