@inproceedings{Watson:2020KF, author = "Watson, Alan", title = "{The Origins of the Highest Energy Particles in Nature - where we've got to and where we go next}", doi = "10.22323/1.358.1188", booktitle = "Proceedings of 36th International Cosmic Ray Conference {\textemdash} PoS(ICRC2019)", year = 2020, volume = "358", pages = "1188" }