An Efficient Trie-based Method for Approximate Entity Extraction with Edit-Distance Constraints Dong Deng (Tsinghua,China) Guoliang Li (Tsinghua,China) Jianhua Feng (Tsinghua,China) h -1911-Dong Deng (Tsinghua, China) Guoliang Li (Tsinghua, China) Jianhua Feng (Tsinghua, China)