1. Coon, H. G., Proc. US Nat. Acad. Sci., 55, 66 (1966).
2. Basset, C. A. L., J. Bone and Joint Surg., 44 A, 1217 (1962).
3. Grobstein, C., and Parker, G., Proc. Soc. Exp. Biol., 85, 477 (1954).
4. Lash, J. W., The Stability of the Differentiated State (edit. by Ursprung, H.) (Springer-Verlag, New York, 1968).
5. Holtzer, H., and Abbott, J., The Stability of the Differentiated State (edit. by Ursprung, H.) (Springer-Verlag, New York, 1968).