1. Über Lichtabsorption von Wasser und Algen in nat. Gewassern;Ålvik;Bergens MusuemsÅrsbok. Naturv. rekke,1937
2. The physiological limits of visual discrimination;Barlow,1964
3. Wavelength regulation in visual pigments;Blatz;Expl Eye Res.,1973
4. Variation in the λmax of rhodopsin from individual frogs;Bowmaker;Vision Res.,1975
5. The utilization of solar energy by aquatic organisms;Clarke,1939