TY - Computer Science A1 - ZHANG Shu-bo, ZHANG Yin, ZHANG Bin and SUN Da-ming T1 - Combined Query Expansion Method Based on Copulas Framework Y1 - 2018-11-14 JF - Computer Science JO - Computer Science SP - 485 EP - 488 VL - 43 IS - Z6 UR - https://www.jsjkx.com N1 - 10.11896/j.issn.1002-137X.2016.6A.114 ER -