1. BROWN, B.P.: Hematology: principles and procedures. 1st edition. Lea & Febiger, Philadelphia, (1973).
2. BUCKLEY, R.; J. HACKNEY; K. CLARK; and C. POSIN: Arch. Environ. Hlth.30, 40 (1975).
3. CALABRESE, E.J.; W. KOJOLA; and B.W. CARNOW: J. Toxicol. Environ. Hlth.2, 704 (1977).
4. DIXON, W.J. and F.J. MASSEY: Introduction to Statistical Analysis, 3rd edition. McGraw-Hill Book Co., New York. (1969).
5. GARDNER, D.E.: Environ. Health Perspect.29, 45 (1979).