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Kolb, E. M.; Rezende, E. L.; Holness, L.; Radtke, A.; Lee, S. K.; Obenaus, A.; Garland (2013). "Mice selectively bred for high voluntary wheel running have larger midbrains: support for the mosaic model of brain evolution". Journal of Experimental Biology. 216: 515–523. doi:10.1242/jeb.076000. PMID23325861.
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"Archived copy". Diarkibkan daripada yang asal pada 2011-04-27. Dicapai pada 2011-03-05.CS1 maint: archived copy as title (link)
Damier, P.; Hirsch, E. C.; Agid, Y.; Graybiel, A. M. (1999-08-01). "The substantia nigra of the human brainII. Patterns of loss of dopamine-containing neurons in Parkinson's disease". Brain. 122 (8): 1437–1448. doi:10.1093/brain/122.8.1437. ISSN0006-8950. PMID10430830.