1. Pott, P., Chirurgical Observations Relative to the Cataract, the Polypus of the Nose, the Cancer of the Scrotum, the Different Kinds of Ruptures, and the Mortification of the Toes and Feet: 1775, L. Hawes, W. Clarke and R. Collins, London.
2. Cook, J., Hewett, C.L. and Hieger, I.: 1933, J. Chem. Soc. p. 395.
3. Particulate Polycyclic Organic Matter: 1972, National Academy of Science, Washington, D.C.
4. Dipple, A., in C.E. Searle (ed.), Chemical Carcinogens, ACS Monograph 173: 1976, Am. Chem. Soc, Washington D.C.
5. Suess, M.J.: 1976, Sci. Total Environ. 6 p. 239.