@article{Eschenburg2002,
  author    = {Jost-Hinrich Eschenburg},
  title     = {Almost positive curvature on the Gromoll-Meyer 7-sphere},
  journal   = {Proceedings of the American Mathematical Society},
  volume    = {130},
  number    = {4},
  pages     = {1165 -- 1167},
  doi       = {10.1090/S0002-9939-01-06151-2},
  year      = {2002},
}