Felleman, Daniel J., and David C. Van Essen. “Distributed Hierarchical Processing in the Primate Cerebral Cortex.” Cerebral Cortex 1, no. 1 (January–February 1991): 1. Hilgetag, Claus C., and Alexandros Goulas. “‘Hierarchy’ in the Organization of Brain Networks.” Philosophical Transactions of the Royal Society B: Biological Sciences 375, no. 1796 (April 2020). Sherman, S. Murray, and R. W. Guillery. “Distinct Functions for Direct and Transthalamic Corticocortical Connections.” Journal of Neurophysiology 106, no. 3 (September 2011): 1068–1077.

