Ribi, WA Former Department Comparative Neurobiology, Max Planck Institute for Biological Cybernetics, Max Planck Society;
https://link.springer.com/content/pdf/10.1007/BF00216567.pdf (Publisher version)
Ribi, W., & Scheel, M. (1981). The second and third optic ganglia of the worker bee: Golgi studies of the neuronal elements in the medulla and lobula. Cell and Tissue Research, 221(1), 17-43. doi:10.1007/BF00216567.