@inproceedings{Broadhurst:2018Ms,
  author = "Broadhurst, David",
  title = "{Quadratic relations between Feynman integrals}",
  doi = "10.22323/1.303.0053",
  booktitle = "Proceedings of Loops and Legs in Quantum Field Theory {\textemdash} PoS(LL2018)",
  year = 2018,
  volume = "303",
  pages = "053"
}