Reichardt, W Former Department Information Processing in Insects, Max Planck Institute for Biological Cybernetics, Max Planck Society; Max Planck Institute for Biological Cybernetics, Max Planck Society;
https://link.springer.com/content/pdf/10.1007/BF00603660.pdf (Publisher version)
Reichardt, W. (1987). Evaluation of optical motion information by movement detectors. Journal of Comparative Physiology A, 161(4), 533-547. doi:10.1007/BF00603660.