1. DeRobertis, E. D. P., Nowinski, W. W., Saez, F. A.: General Cytology, 3rd ed., Philadelphia: Saunders 1960
2. Daems, W. Th., Wisse, E., Brederoo, P.: Electron microscopy of the vacuolar appartus. In: Dingle, J. T., Fell, H. B. (eds.) Lysosomes in Biology and Pathology, Vol. 1. Amsterdam-London: North Holland 1959
3. Ericsson, J. L. E.: Cellular autophagy. In: Dingle, J. T., Fell, H. B. (eds.) Lysosomes in Biology and Pathology, Vol. 2. Amsterdam-London: North Holland 1969
4. Strehler, B. L.: Molecular biology of aging. Naturwissenschaften 56, 57 (1969)
5. Hamperl, H.: Die Fluorescenzmikroskopie menschlicher Gewebe. Virchows Arch. path. Anat. 292, 1 (1934)