Using External Resources and Joint Learning for Bigram Weighting in ILP-Based Multi-Document Summarization Chen Li author Yang Liu author Lin Zhao author 2015-may–jun text Proceedings of the 2015 Conference of the North American Chapter of the Association for Computational Linguistics: Human Language Technologies Rada Mihalcea editor Joyce Chai editor Anoop Sarkar editor Association for Computational Linguistics Denver, Colorado conference publication li-etal-2015-using-external 10.3115/v1/N15-1079 https://aclanthology.org/N15-1079/ 2015-may–jun 778 787