Tim Malmström, Ronald H. H. Kröger: Pupil shapes and lens optics in the eyes of terrestrial vertebrates. In: The Journal of Experimental Biology. Bd. 209, 2005, ISSN0022-0949, S. 18–25, doi:10.1242/jeb.01959.
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Roman Liedl, Norbert Netzer: Physiologische Optik. Universität Innsbruck. S. 33.
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Tim Malmström, Ronald H. H. Kröger: Pupil shapes and lens optics in the eyes of terrestrial vertebrates. In: The Journal of Experimental Biology. Bd. 209, 2005, ISSN0022-0949, S. 18–25, doi:10.1242/jeb.01959.