1. Leibovic, K.N.: Principles of brain function: information processing in convergent and divergent pathways. In: Pichler, F., Trappl, R. (eds.) Progress in Cybernetics and Systems, vol. VI, pp. 91–99. Hemisphere, Washington, D.C. (1982)
2. Moreno-Díaz, A., de Blasio, G., Moreno-Díaz Jr. R.: Distributed, layered and reliable computing nets to represent neuronal receptive fields. Math. Biosci. Eng. 11(2), 343–361 (2014)
3. Moreno-Díaz Jr., R.: Computación paralela y distribuida: relaciones estructura-función en retinas. Ph.D thesis, Universidad de Las Palmas de Gran Canaria (1993)
4. http://www.mathpages.com/home/kmath012/kmath012.htm
5. Carlitz, L., Kurtz, D.C., Scoville, R., Stakelber, O.P.: Asymptotic properties of Eulerian numbers. Zeitschrift für Wahrscheinlichkeitstheorie und Verwandte Gebiete 23(1), 47–54 (1972)