1. Researches in colour vision;Abney,1913
2. Festing. Colour photometry;Abney;Philos. Trans. R. Soc. (Lond.),1886
3. Die Lehrschriften. 8.1 Tierkunde,1951-1961
4. Color difference and color opponency in bees;Backhaus,1988
5. Opponent color coding and color perception in bees;Backhaus,1988