1. 1) Golgi, C. (1873): Sulla struttura della sostanza grigia del cervello, Gazzetta Medica Italiana, Vol.33, pp.244-246.
2. 2) Ramón y Cajal, S. (1899): Comparative study of the sensory areas of the human cortex, Clark University.
3. 3) Adrian, E.D. (1928): The Basis of Sensation: The Action of the Sense Organs, Christopher: London.
4. 4) Hubel, D.H. (1957): Tungsten microelectrode for recording from single units, Science, Vol.125, pp.549-550.
5. 5) Hubel, D.H., Wiesel, T.N. (1959): Receptive fields of single neurones in the cat's striate cortex, J. Physiol., Vol.148, pp.574-591.