2Wearne S J, Gem MG de M, Harrison N,et al. Contaminants of food: Prioritisation scheme to identify manufactured organic chemicals as potential contaminants of food [ J ]. Environmental Science and Pollution Research, 1996, (2) :83 - 88.
3Li C, Ma H, Zhou Y, et al. Similarity analysis of DNA se- quences bases on the weighted pseudo-entropy [ J]. J. Corn- put. Chem. ,2011,(04):675-680.
4Li C, Wang J. New invariant of DNA sequences [ J ]. J. Chem. Inf. Model. ,2005,(45) :115 - 120.
