TY - Journal of Shandong University(Engineering Science) A1 - LIU Xiaoyong T1 - A semi-supervised method based on tree kernel for relationship extraction Y1 - 2015-04-20 JF - Journal of Shandong University(Engineering Science) JO - Journal of Shandong University(Engineering Science) SP - 22 EP - 26 VL - 45 IS - 2 UR - http://gxbwk.njournal.sdu.edu.cn N1 - 10.6040/j.issn.1672-3961.1.2014.259 ER -