M.  Dacke, Nordstrom, P., and Scholtz, C. H., ?Twilight orientation to polarised light in the crepuscular dung beetle Scarabaeus zambesianus?, The Journal of Experimental Biology, vol. 206, pp. 1535-1543, 2003.

M.  Dacke, Nordstrom, P., Scholtz, C. H., and Warrant, E. J., ?A specialized dorsal rim area for polarized light detection in the compound eye of the scarab beetle Pachysoma striatum?, Journal of Comp. Physiology A, vol. 188, pp. 211-216, 2002.