@article{Salvini_Plawen_1977,
  title = {{On the Evolution of Photoreceptors and Eyes}},
  isbn = {http://id.crossref.org/isbn/978-1-4615-6953-4},
  url = {http://dx.doi.org/10.1007/978-1-4615-6953-4_4},
  doi = {10.1007/978-1-4615-6953-4_4},
  journal = {Evolutionary Biology},
  publisher = {Springer US},
  author = {Salvini-Plawen, L. and Mayr, Ernst},
  year = {1977},
  pages = {207–263},
}


@article{Oakley_2008,
  title = {{Opening the “Black Box”: The Genetic and Biochemical Basis of Eye Evolution}},
  volume = {1},
  issn = {1936-6434},
  url = {http://dx.doi.org/10.1007/s12052-008-0090-3},
  doi = {10.1007/s12052-008-0090-3},
  number = {4},
  journal = {Evo Edu Outreach},
  publisher = {Springer Science + Business Media},
  author = {Oakley, Todd H. and Pankey, M. Sabrina},
  year = {2008},
  month = {Oct},
  pages = {390–402},
}


@article{Nilsson_1994,
  title = {{A Pessimistic Estimate of the Time Required for an Eye to Evolve}},
  volume = {256},
  issn = {1471-2954},
  url = {http://dx.doi.org/10.1098/rspb.1994.0048},
  doi = {10.1098/rspb.1994.0048},
  number = {1345},
  journal = {Proceedings of the Royal Society B: Biological Sciences},
  publisher = {The Royal Society},
  author = {Nilsson, D.-E. and Pelger, S.},
  year = {1994},
  month = {Apr},
  pages = {53–58},
}


@article{Oakley_2002,
  title = {{Molecular phylogenetic evidence for the independent evolutionary origin of an arthropod compound eye}},
  volume = {99},
  issn = {1091-6490},
  url = {http://dx.doi.org/10.1073/pnas.032483599},
  doi = {10.1073/pnas.032483599},
  number = {3},
  journal = {Proceedings of the National Academy of Sciences},
  publisher = {Proceedings of the National Academy of Sciences},
  author = {Oakley, T. H. and Cunningham, C. W.},
  year = {2002},
  month = {Feb},
  pages = {1426–1430},
}


@article{Marazzi_2012,
  title = {{Locating Evolutionary Precursors on a Phylogenetic Tree}},
  volume = {66},
  issn = {0014-3820},
  url = {http://dx.doi.org/10.1111/j.1558-5646.2012.01720.x},
  doi = {10.1111/j.1558-5646.2012.01720.x},
  number = {12},
  journal = {Evolution},
  publisher = {Wiley-Blackwell},
  author = {Marazzi, Brigitte and Ané, Cécile and Simon, Marcelo F. and Delgado-Salinas, Alfonso and Luckow, Melissa and Sanderson, Michael J.},
  year = {2012},
  month = {Dec},
  pages = {3918–3930},
}