References
- Einhorn J., Jakobsson P. Multiple primary malignant tumours. Cancer 1964; 17: 1437–1444
- McKee G. M., Cipollaro A. C. Cutaneous cancer and precancer; a practical monograph. New York. Am J Cancer. 1937
- Ringertz N., Törnberg B., Sjöström Å., Swenson D. Cancer incidence in Sweden 1959. National Board of Health, The Cancer Registry, StockholmSweden 1962
- Shafer W. G., Waldron C. A. A clinical and histopathologic study of oral leukoplakia. Surg Gynec Obst 1961; 112: 411–420