@InProceedings{qian-EtAl:2009:EMNLP,
  author    = {Qian, Longhua  and  Zhou, Guodong  and  Kong, Fang  and  Zhu, Qiaoming},
  title     = {Semi-Supervised Learning for Semantic Relation Classification using Stratified Sampling Strategy},
  booktitle = {Proceedings of the 2009 Conference on Empirical Methods in Natural Language Processing},
  month     = {August},
  year      = {2009},
  address   = {Singapore},
  publisher = {Association for Computational Linguistics},
  pages     = {1437--1445},
  url       = {http://www.aclweb.org/anthology/D/D09/D09-1149}
}