pdfSpan Detection for Aspect-Based Sentiment Analysis in VietnameseKim Nguyen Thi Thanh | Sieu Huynh Khai | Phuc Pham Huynh | Luong Phan Luc | Duc-Vu Nguyen | Kiet Nguyen VanProceedings of the 35th Pacific Asia Conference on Language, Information and Computation