@inproceedings{shen-li-2011-non,
    title = "A Non-negative Matrix Factorization Based Approach for Active Dual Supervision from Document and Word Labels",
    author = "Shen, Chao  and
      Li, Tao",
    editor = "Barzilay, Regina  and
      Johnson, Mark",
    booktitle = "Proceedings of the 2011 Conference on Empirical Methods in Natural Language Processing",
    month = jul,
    year = "2011",
    address = "Edinburgh, Scotland, UK.",
    publisher = "Association for Computational Linguistics",
    url = "https://aclanthology.org/D11-1088/",
    pages = "949--958"
}