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/BF00366085.pdf (Publisher version)
Guo, A., & Reichardt, W. (1987). An estimation of the time constant of movement detectors. Die Naturwissenschaften, 74(2), 91. doi:10.1007/BF00366085.