TY - Front. Chem. China A1 - Wang Yan, Yao Lijuan, Zhao Pengcheng, Wang Jinghan, Wang Yanji T1 - Determining the relative age of blue ballpoint ink by gas chromatography Y1 - 2006-06-05 JF - Frontiers of Chemistry in China JO - Front. Chem. China SP - 223 EP - 226 VL - 1 IS - 2 UR - https://journal.hep.com.cn/fcc N1 - 10.1007/s11458-006-0014-o ER -