@inproceedings{Fruck:2019iK, author = "Fruck, Christian and Henningsen, Felix and Spannfellner, Christian", title = "{The POCAM as self-calibrating light source for the IceCube Upgrade}", doi = "10.22323/1.358.0908", booktitle = "Proceedings of 36th International Cosmic Ray Conference {\textemdash} PoS(ICRC2019)", year = 2019, volume = "358", pages = "908" }