1. Astrom, K. E.: On the early development of the isocortex in fetal sheep. In: Developmental Neurology. Progress in Brain Research, Vol. 26 (eds. C. G. Bernhard and J. P. Schadé), pp. 1–59 New York: Elsevier 1967
2. Brodmann, K.: Vergleichende Lokalisationslehre der Großhirnrinde in ihren Prinzipien dargestellt auf Grund des Zellenbaues. Leipzig: J. A. Barth 1909
3. Caviness, V. S., Jr., Rakic, P.: Mechanisms of cortical development: a view from mutations in mice. In: Annual Review of Neuroscience (eds. W. M. Cowan, Z. W. Hall, and E. R. Kandel). Palo Alto: Annual Reviews, Inc. 1978 (in press)
4. Chi, J. G., Dooling, E. C., Gilles, F. H.: Gyral development of the human brain. Ann. Neurol.1, 86–93 (1977)
5. Crome, L., Stern, J.: Pathology of Mental Retardation. London: Churchill Livingston 1972