1. E. J. Fjerdingstad,Chemical Transfer of Learned Information (North-Holland Publishing Co., Amsterdam 1971).
2. H. P. Zippel,Memory and Transfer of Information (Plenum Press, New York 1973).
3. G. F. Domagk, inCurrent Topics in Cellular Regulation (Academic Press, New York 1972), vol. 5, pp. 77.
4. G. Chapouthier, inThe Physiological Basis of Memory (Ed.J. A. Deutsch; Academic Press, New York 1973), p. 1.
5. G. Ungar, Naturwissenschaften60, 307 (1973).