EFFECTS OF β-Β CAROTENE AND CHLOROPHYLL IN ON INCIDENCE OF MAMMARY TUMOR INDUCED BYD IMETHYLBEN (A) ANTHRACENE IN RAT Carcinogenesis, Teratogenesis & Mutagenesis . 1997, (2): 99 -102 .  DOI: 10.3969/j.issn.1004-616x.1997.02.007