@article{BaerStrohmaier2019,
  author    = {Christian B{\"a}r and Alexander Strohmaier},
  title     = {An index theorem for Lorentzian manifolds with compact spacelike Cauchy boundary},
  journal   = {American Journal of Mathematics},
  volume    = {141},
  number    = {5},
  pages     = {1421 -- 1455},
  doi       = {10.1353/ajm.2019.0037},
  year      = {2019},
}