1. Mateles, R. I., and Tannenbaum, S. R., (eds.), Single-Cell Protein (MIT Press, Cambridge, Massachusetts, and London, 1968).
2. International Action to Avert the Impending Protein Crisis (United Nations, New York, 1968).
3. Wintz, H., Munch. Med. Wschr., 63, 445 (1916).
4. Salomon, H., Munch. Med. Wschr., 63, 454 (1916).
5. Funk, C., Lyle, W. G., and McCaskey, D., J. Biol. Chem., 27, 173 (1916).