1. Anderson, W. A., and R. A. Ellis: A comparative electron microscope study of visceral muscle fibers in Cambarus, Drosophila and Lumbricus. Z. Zellforsch. 79, 581?591 (1967).
2. Ashhurst, D. E. and J. A. Chapman: The connective tissue sheath of the nervous system of Locusta migratoria: an electron microscope study. Quart. J. micr. Sci. 102, 463?467 (1961).
3. Baccetti, B.: Primi reperti sulla struttura submicroscopica dello stroma di sostegno di alcuni organi degli Insetti. Atti Accad. Sci. Torino 95, 343?350 (1961).
4. ?, et E. Bigliardi: Nouvelles données sur l'ultrastructure du coeur des Insectes. J. Microscopie 7, 209 (1968).
5. ?, et E. Bigliardi: Studies on the fine structure of the dorsal vessel of Arthropods. I. The ?heart? of an orthopteran. Z. Zellforsch. 99, 13?24 (1969).