@article{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",
  journal = "PoS",
  year = 2018,
  volume = "LL2018",
  pages = "065"
}