@ARTICLE{RuWi12b,
  author = {Rumpf, Martin and Wirth, Benedikt},
  title = {Variational time discretization of geodesic calculus},
  journal = {IMA J. Numer. Anal.},
  year = {2015},
  volume = {35},
  pages = {1011--1046},
  number = {3},
  doi = {10.1093/imanum/dru027},
  eprint = {1210.2097},
  fjournal = {IMA Journal of Numerical Analysis},
  owner = {rumpf}
}