1. Extraocular perception of polarized light by orienting salamanders;Adler;Journal of Comparative Physiology,1973
2. Receptive field organization of ganglion cells in the frog retina: contributions from cones, green rods and red rods;Bäckström;Journal of Physiology (London),1975
3. Summation and inhibition in the frog's retina;Barlow;Journal of Physiology (London),1953
4. Amphibians, their evolutionary history, taxonomy and ecological adaptations;Blair,1976
5. Efferent fibers in the frog optic nerve;Branston;Experimental Neurology,1968