1. Ungar, G., and Oceguera-Navarro, C., Nature, 207, 301 (1965).
2. Ungar, G., in Protides of the Biological Fluids, 1965 (edit. by Peeters, H.), 151 (Elsevier, Amsterdam, 1966).
3. Ungar, G., and Cohen, M., Intern. J. Neuropharmacol., 5, 183 (1966).
4. Ungar, G., and Irwin, L. N., Nature, 214, 453 (1967).
5. Ungar, G., J. Biol. Psychol., 9, 12 (1967).