1Chen J L,Wang Z F,Wu J H,et al. Chemical compositional characterization of eight pear cultivars grown in China[ J]. Food Chemistry,2007,104 : 268 -275.
2Roth E, Bema A, Beullens K, et al. Postharvest quality of integrated and organically produced apple fruit [ J ]. PostharvestBiology and Technology,2007,45 : 11 - 19.