1. Ohta , Y. , Inui , M. , Shiraishi , H. , Tabata , Y. and Wakisaka , I. Investigation of carbon black dust deposited in human lungs with special reference to influence of the environment . Proceedings of the Vlth World Congress on Air Quality . May 1983 . Vol. 2 , pp. 181 – 88 . Paris : France.
2. Free-Radicals produced in Cigarette Smoke
3. Swartz , H. M. 1972 .Biological Application of Electron Spin Resonance340 New York : Wily-lnterscience.
4. Ayscough , P. B. 1967 .Electron Spin Resonance in Chemistry374 London : Methuen.
5. The Radicals in Cigarette Tar: Their Nature and Suggested Physiological Implications