@article{Kroencke2016,
  author    = {Klaus Kr{\"o}ncke},
  title     = {Rigidity and Infinitesimal Deformability of Ricci Solitons},
  journal   = {The journal of geometric analysis},
  volume    = {26},
  pages     = {1795 -- 1807},
  doi       = {10.1007/s12220-015-9608-4},
  year      = {2016},
}