Bonhoeffer, T Former Department Structure and Function of Natural Nerve-Net , Max Planck Institute for Biological Cybernetics, Max Planck Society;
https://journals.lww.com/neuroreport/Abstract/1990/10000/Non_Hebbian_synapses_in_rat_visual_cortex.8.aspx (Publisher version)
Kossel, A., Bonhoeffer, T., & Bolz, J. (1990). Non-Hebbian synapses in rat visual cortex. NeuroReport, 1(2), 115-118. doi:10.1097/00001756-199010000-00008.