Song, S; Sjostrom, PJ; Reigl, M; Nelson, S; Chklovskii, DB; (2005) Highly nonrandom features of synaptic connectivity in local cortical circuits (vol 3, pg e68, 2005). PLOS BIOL , 3 (10) , Article e350. 10.1371/journal.pbio.0030350. Green open access