Automatic Derivation of Surface Text Patterns for a Maximum Entropy Based Question Answering System Deepak Ravichandran author Abraham Ittycheriah author Salim Roukos author 2003 text Companion Volume of the Proceedings of HLT-NAACL 2003 - Short Papers conference publication ravichandran-etal-2003-automatic https://aclanthology.org/N03-2029/ 2003 85 87