1. Andres, K. H.: Über die Feinstruktur der Arachnoidea und Dura mater von Mammalia. Z. Zellforsch.79, 272–295 (1967)
2. Cajal, R.: Degeneration and Regeneration of the Nervous System. R. M. May (transl.). London: Oxford University Press 1928
3. Chou, S. M., Fakadej, A. V.: Ultrastructure of chromatolytic motor neurons and anterior spinal roots in a case of Werdnig-Hoffmann disease. J. Neuropath. exp. Neurol.30, 368–379 (1971)
4. Chou, S. M.: Infantile spinal muscular atrophy: Correlation between alterations in anterior spinal roots and muscle fibre atrophy. In: Kakulas, B. A. (ed.). Clinical studies in myology, Part 2, pp. 206–217. Amsterdam: Excerpta Medica 1973
5. Gamble, H. J.: Comparative electron microscopic observations on the connective tissues of a peripheral nerve and a spinal nerve root in the rat. J. Anat. (London)98, 17–25 (1964)