References
- Webster's Third New International Dictionary of the English Language, Unabridged, P. B. Gove. C & G Merriam Co., Springfield, Mass. 1964; 423, 2273
- Stedman's Medical Dictionary, 22nd ed. Williams and Wilkins, Baltimore, Md. 1972; 260, 1209
- Waldron H. A., Stofen D. Sub-clinical Lead Poisoning. Academic, New York 1974; IX–X
- Van Duuren B. L., Sivak A., Katz C., Seidman I., Melchionne S. The effect of aging and interval between primary and secondary treatment in two-stage carcinogenesis on mouse skin. Cancer Res. 1975; 35: 502