@article{Gierer2006,
  author    = {Alfred Gierer},
  title     = {Directional cues for growing axons forming the retinotectal projection},
  url       = {http://edoc.bbaw.de/oa/articles/reMcGbnMcQdg/PDF/28xA7zWCEUA5Y.pdf},
  year      = {2006},
}