1. S. M. Blinkov and I. I. Glezer, The Human Brain in Figures and Tables [in Russian], Leningrad (1964), p. 272; English Translation, New York (1968).
2. N. D. Gracheva, in the book: Investigation of Cell Cycles and Nucleic Acid Metabolism during Cell Differentiation [in Russian], Moscow-Leningrad (1964), p. 90.
3. Yu. M. Zhabotinskii, Normal and Pathological Morphology of the Neuron [in Russian], Leningrad (1965).
4. L. L. Bennett, Jr., L. Simpson, and H. E. Skipper Biochim. Biophys. Acta,42, 237 (1960).
5. R. S. Chang and H. Vetrovs, Science,139, 1211 (1963).