Detection of Ca,Fe,Zn and Cu contents in hair of 675 primary and
 secondary school students and its significance
YANG Si-jia,CHEN Yang,XU Shan-shan,PAN Yang,YAO Yu-hang,YANG Xue-ling,LI Bo
Journal of Jilin University(Medicine Edition) . 2013, (2): 391 -395 .  DOI: 10.7694/jldxyxb20130246