1. Bargmann, W.: Der Thymus. In: Handbuch der mikroskopischen Anatomie des Menschen, herausgeg. von W. v. Möllendorff, Bd. VT/4, S. 1?172, Berlin: Springer 1943.
2. Barka, I., Anderson, P. J.: Histochemistry; theory, practice and bibliography. New York, Evanston and London: Harper & Row 1963.
3. Clark, S. L., Jr.: The thymus in mice of strain 129/J, studied with the electron microscope. Amer. J. Anat. 112, 1?34 (1963).
4. Duve, C. de: The lysosome concept. In: Ciba Foundation Symp. Lysosomes, p. 1?31 (ed. de Reuck, A. V. S., and Cameron, M. P.) London: J. & A. Curchill Ltd. 1963.
5. Geyvai, A., Kapa, E.: Succinic dehydrogenase activity in the thymus of laboratory rodents. Acta morph. Acad. Sci. hung. 10, 49?58 (1961).