1. Autrum, H. and von Zwehl, V. (1964) Die spectrale Empfindlichkeit einzelner Sehzellen des Bienenauges. Z. Vergl Physiol 48, 357–384
2. Backhaus, W. (1991) Color opponent coding in the visual system of the honeybee, Vision Res. 31, 1381–1397.
3. Brandt, R. and Vorobyev, M. (1996) Metric analysis of threshold spectral sensitivity in the honeybee. Vision Res (in press)
4. Chittka, L. (1992) The color hexagon: a chromaticity diagram based on photoreceptor excitations as a generalized representation of colour opponency, J Comp Physiol A, 170, 533–543.
5. Chittka, L. (1996) Does bee color vision predate the evolution of flower color? Naturwissenschaften, 83, 136–138.