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;
https://link.springer.com/content/pdf/10.1007/BF01226058.pdf (Publisher version)
Palm, G. (1978). Additive entropy requires additive measure. Archiv der Mathematik, 30(1), 293-296. doi:10.1007/BF01226058.