TY - Journal of East China Normal University(Natural Science) A1 - YANG Dong-ming, YANG Da-wei, GU Hang, HONG Dao-cheng, GAO Ming, WANG Ye T1 - Research on knowledge point relationship extraction for elementary mathematics Y1 - 2019-09-25 JF - Journal of East China Normal University(Natural Science) JO - Journal of East China Normal University(Natural Science) SP - 53 EP - 65 VL - 2019 IS - 5 UR - https://xblk.ecnu.edu.cn N1 - 10.3969/j.issn.1000-5641.2019.05.004 ER -