Braitenberg, V Former Department Structure and Function of Natural Nerve-Net, Max Planck Institute for Biological Cybernetics, Max Planck Society;
Braitenberg, V., Gambardella G, Ghigo, G., & Vota, U. (1965). Observations on spike sequences from spontaneously active Purkinje cells in the frog. Kybernetik, 2(5), 197-205. doi:10.1007/BF00306415.