Goralczyk, R (2009). "ß-Carotene and Lung Cancer in Smokers: Review of Hypotheses and Status of Research". Nutrition and Cancer. ج. 61 ع. 6: 767–774. DOI:10.1080/01635580903285155. PMID:20155614.
nih.gov
pubmed.ncbi.nlm.nih.gov
Goralczyk, R (2009). "ß-Carotene and Lung Cancer in Smokers: Review of Hypotheses and Status of Research". Nutrition and Cancer. ج. 61 ع. 6: 767–774. DOI:10.1080/01635580903285155. PMID:20155614.