1. Estructura de los centros nerviosos de las aves;Ramón y Cajal;Rev. Trim. Histol. Norm. Pat.,1888
2. Electron microscopy of synaptic contacts on dendritic spines of the cerebral cortex;Gray;Nature,1959
3. La Textura del Sistema Nerviosa del Hombre y los Vertebrados;Ramón y Cajal,1899
4. Synaptic patterns on different cell types in the different laminae of the cat visual cortex. An electron microscope study;Colonier;Brain Res.,1968
5. Anatomy of the cortex;Braitenberg,1998