@article{recognizingextendedspatiotemporal,
  title = {Recognizing Extended Spatiotemporal Expressions by Actively Trained Average Perceptron Ensembles},
  author = {Wei Zhang and Yang Yu and Osho Gupta and Judith Gelernter},
  year = {2015},
  eprint = {1508.04525},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1508.04525v1},
}