1. Ashhurst, D. E.: The connective tissues of insects. In: Annual review of entomology, vol. 13, R. F. Smith, T. E. Mittler, eds., p. 45?74. Palo Alto: Annual Reviews 1968
2. Fawcett, D. W.: An atlas of fine structure, the cell, its organelles and inclusions, p. 353. Philadelphia: Saunders 1966
3. Gouranton, J.: Etude d'une lame basale presentant une structure d'un type nouveau. J. Microscopic 9, 1029?1040 (1970)
4. Holter, P.: Regular grid-like substructures in the midgut epithelial basement membrane of some Coleoptera. Z. Zellforsch. 110, 373?385 (1970)
5. Pease, D. C.: Histological techniques for electron microscopy, p. 39. New York-London: Academic Press 1964