1. Ramon y Cajal, S. R. Histologie du Système Nerveux de l'Homme et des Vertébrés (Maloine, Paris, 1911)
2. Rakic, P. Local circuit neurons. Neurosci. Res. Prog. Bull. 13, 1–399 (1975)
3. Gupta, A., Wang, Y. & Markram, H. Organizing principle for diversity of GABAergic interneurons and synapses in the neocortex. Science 287, 273–278 (2000)
4. Fairen, A., DeFelipe, J. & Regidor, J. in Cellular Components of the Cerebral Cortex (eds Peters, A. & Jones, E. G.) 201–253 (Plenum, New York, 1984)
5. Marin, O., Yaron, A., Bagri, A., Tessier-Lavigne, M. & Rubenstein, J. L. R. Sorting of striatal and cortical interneurons regulated by semaphorin-neuropilin interactions. Science 293, 872–875 (2001)