1. Bethell, F. H., R. Isaacs, S. M. Goldhammer and C. S. Sturgis: Blood. A review o the recent literature. Arch. int. Med. 61, 923 (1938).
2. Cook, J. W., G. A. D. Haslewood, C. J. Hewett, J. Hieger, E. L. Kennaway and W. V. Mayneord: Chemical compounds as carcinogenic agent. Amer. J. Canc. 29, 219 (1937).
3. Dale, H.: Viruses and heterogenesis. Huxley Memorial Lecture. London 1935.
4. Engelbreth-Holm, J.: Tumour-producing viruses in fowls. Acta path. scand. (Københ.), Suppl. 38, 26 (1938).
5. Forkner, CI. E.: Leukemia and allied disorders. New York: Macmillan 1938.