TY - Computer Science A1 - WANG Xu-yang and WEI Xing-xing T1 - Query Expansion Method Based on Ontology and Local Co-occurrence Y1 - 2018-11-13 JF - Computer Science JO - Computer Science SP - 214 EP - 218 VL - 44 IS - 1 UR - https://www.jsjkx.com N1 - 10.11896/j.issn.1002-137X.2017.01.041 ER -