Burr, 1984

Burr A.H. (1984) Evolution of Eyes and Photoreceptor Organelles in the Lower Phyla. In: Ali M.A. (eds) Photoreception and Vision in Invertebrates. NATO ASI Series (Series A: Life Sciences), vol 74. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-2743-1_5 http://summit.sfu.ca/system/files/iritems1/17014/EvolEyes%2526PRs1984.pdf