1. International Agency for Research on Cancer. Agents Classified by THE IARC Monographs, vols. 1‒115. http://monographs.iarc.fr./ENG/Classification/latest_classif.php. Accessed May 6, 2016.
2. Yamamura, J., J. UOEH, 1989, vol. 11, p. 495.
3. Dombrow, B.A. and Siegfried, A., US Patent 3154583, 1964.
4. Normington, J.B., Hort, E.V., and Freyermuth, H.B., US Patent 2964561, 1960.
5. McKellar, J., Proc. R. Soc. London, Ser. A, 1965, vol. 287, p. 363.