Reichardt, W Former Department Information Processing in Insects, Max Planck Institute for Biological Cybernetics, Max Planck Society;
Reichardt, W., Egelhaaf, M., & Guo, A.-K. (1989). Processing of figure and background motion in the visual system of the fly. Biological Cybernetics, 61(5), 327-345. doi:10.1007/BF00200799.