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11. J. Storer: Personal communication. 



12. J. P. Storaasli, S. Rosenberg, J. S. Krohmer, and H. L. Friedell: Effect of short 

 interval fractionation on the lethal properties of total body radiation in rats. Western 

 Reserve University Atomic Energy Medical Research Project Report NYO 4919 (1955). 



13. J. B. HuRSH, and G. W. Casarett: Unpublished observations. 



14. R. Baxter: Unpublished observations. 



15. H. P. Yockey: An application of information theory to the physics of tissue damage. 

 Radiat. Res. 5, 146-155 (1956). 



16. H.A.Blair: Data pertaining to shortening of life span by ionizing radiation. University 

 of Rochester Report UR 442 (1956). 



17. P. S. Henshaw: Experimental roentgen injury. IV. Effects of repeated small doses 

 of x-rays on blood picture, tissue morphology and life span in mice. J. Nat. Cancer 

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