Palm, G Former Department Structure and Function of Natural Nerve-Net , Max Planck Institute for Biological Cybernetics, Max Planck Society; Max Planck Institute for Biological Cybernetics, Max Planck Society;
http://www.numdam.org/article/AST_1976__40__159_0.pdf (Publisher version)
Palm, G. (1976). A common generalization of topological and measure-theoretic entropy. Astérisque, 40, 159-165.