@article{Behring:2022vt,
  author = "Behring, Arnd",
  title = "{Zero-jettiness beam functions at N$^3$LO}",
  doi = "10.22323/1.416.0027",
  journal = "PoS",
  year = 2022,
  volume = "LL2022",
  pages = "027"
}