TY - Computer Science A1 - DING Feng, SUN Xiao T1 - Negative-emotion Opinion Target Extraction Based on Attention and BiLSTM-CRF Y1 - 2022-02-15 JF - Computer Science JO - Computer Science SP - 223 EP - 230 VL - 49 IS - 2 UR - https://www.jsjkx.com N1 - 10.11896/jsjkx.210100046 ER -