4Li Y, Navia J M, Bian JY. Caries experience in deciduous dentition of rural Chinese children 3 ~ 5 years old in relation to the presence or absence of enamel hypoplasia. Caries Res, 1996,30: 8 - 15.
5Li Y, Wang W. Proceeding caries in permanent teeth from caries in primary teeth:an eight- year cohort study. J Dent Res, 2002,81(8),561-566.
6Shi S. Utility of a new caries activity test. J Kyushu Dent Soc,1998, 52: 613 - 623.