1. Masson, P., in The Biology of Melanomas, 4, 15 (New York Acad. Sci., 1948).
2. Charles, A., and Ingram, J. T., J. Biophys. Biochem. Cytol., 6, 41 (1959).
3. Birbeck, M. S. C., and Mercer, E. H., J. Biophys. Biochem. Cytol., 3, 203 (1956).
4. Birbeck, M. S. C., and Mercer, E. H., in Electron Microscopy, Proc. Stockholm Conf., 156 (1956).
5. Swift, J. A., Ph.D. thesis, Univ. Leeds (1963).