@article{BeniniSchenkel2017,
  author    = {Marco Benini and Alexander Schenkel},
  title     = {Quantum Field Theories on Categories Fibered in Groupoids},
  journal   = {Communications in mathematical physics},
  volume    = {356},
  pages     = {19 -- 64},
  doi       = {10.1007/s00220-017-2986-7},
  year      = {2017},
}