Winters TH, Di Franza JR (February 1982). "Radioactivity in cigarette smoking". The New England Journal of Medicine. 306 (6): 364–5. doi:10.1056/NEJM198202113060613. PMID7054712.
Nagasawa, H.; Little, J. B. (1992-11-15). "Induction of sister chromatid exchanges by extremely low doses of alpha-particles". Cancer Research. 52 (22): 6394–6396. ISSN0008-5472. PMID1423287.
Winters TH, Di Franza JR (February 1982). "Radioactivity in cigarette smoking". The New England Journal of Medicine. 306 (6): 364–5. doi:10.1056/NEJM198202113060613. PMID7054712.
Nagasawa, H.; Little, J. B. (1992-11-15). "Induction of sister chromatid exchanges by extremely low doses of alpha-particles". Cancer Research. 52 (22): 6394–6396. ISSN0008-5472. PMID1423287.