@inproceedings{Martello:20175k, author = "Martello, Daniele", title = "{The Pierre Auger Observatory Upgrade}", doi = "10.22323/1.301.0383", booktitle = "Proceedings of 35th International Cosmic Ray Conference {\textemdash} PoS(ICRC2017)", year = 2017, volume = "301", pages = "383" }