1. Altschul, R.: Endothelium, its development, morphology, function, and pathology. New York: Macmillan 1954.
2. Benewolenskaja, S. W.: Hematopoiesis in cultures of embryonic liver of man. Arch. exp. Zellforsch. 9, 128?141 (1930).
3. Bornstein, M. B.: Reconstituted rat-tail collagen used as substrate for tissue cultures on coverslips in Maximow slides and roller tubes. Lab. Invest. 7, 134?137 (1958).
4. Cameron, G., and R. Chambers: Neoplasm studies III. Organization of cells of human tumors in tissue culture. Amer. J. Cancer 30, 115?129 (1937).
5. Fujita, T.: Histological studies on the neuro-insular complex in the pancreas of some mammals. Z. Zellforsch. 50, 94?109 (1959).