@inproceedings{Panzer:2018e+, author = "Panzer, Erik and Bitoun, Thomas and Bogner, Christian and Klausen, René Pascal", title = "{The number of master integrals as Euler characteristic}", doi = "10.22323/1.303.0065", booktitle = "Proceedings of Loops and Legs in Quantum Field Theory {\textemdash} PoS(LL2018)", year = 2018, volume = "303", pages = "065" }