Synapses on axon collaterals of pyramidal cells are spaced at random intervals: a Golgi study in the mouse cerebral cortex. - Bernhard Hellwig; Almut Schüz; Ad Aertsen (Biol. Cybern., 1994)

A quantitative analysis of the local connectivity between pyramidal neurons in layers 2/3 of the rat visual cortex. - Bernhard Hellwig (Biol. Cybern., 2000)