Zanker, JM 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/BF00198092.pdf (Publisher version)
Zanker, J. (1990). On the directional sensitivity of motion detectors. Biological Cybernetics, 62(3), 177-183. doi:10.1007/BF00198092.