Helmstaedter, Moritz Connectomics Department, Max Planck Institute for Brain Research, Max Planck Society;
http://www.ncbi.nlm.nih.gov/pubmed/17548800 (Any fulltext)
Frick, A., Feldmeyer, D., Helmstaedter, M., & Sakmann, B. (2008). Monosynaptic connections between pairs of L5A pyramidal neurons in columns of juvenile rat somatosensory cortex. Cereb Cortex, 18(2), 397-406. doi:10.1093/cercor/bhm074.