CZ:Ref:DOI:10.1073/pnas.0805417105

Herculano-Houzel, S.; C.E. Collins & P. Wong et al. (2008), "The basic nonuniformity of the cerebral cortex", Proceedings of the National Academy of Sciences 105 (34): 12593-12598, DOI:10.1073/pnas.0805417105 ^[e]

Directly contradicts Rockel et al. (1980) by showing that the number of neurons per unit surface area of neocortex is not constant across mammals but instead varies about three-fold among primates.