@article{Abbe2009,
  author    = {Ernst Abbe},
  title     = {Ueber einen neuen Beleuchtungsapparat am Mikroskop},
  journal   = {Archiv f{\"u}r mikroskopische Anatomie},
  volume    = {9},
  pages     = {469 -- 480},
  year      = {2009},
}