@inproceedings{ijcai2009p221,
  title     = {Transfer Learning Using Task-Level Features with Application to Information Retrieval},
  author    = {Yan, Rong and Zhang, Jian},
  booktitle = {Proceedings of the Twenty-First International Joint Conference on
               Artificial Intelligence, {IJCAI-09}},
  publisher = {International Joint Conferences on Artificial Intelligence},
  editor    = {Hiroaki Kitano},
  pages     = {1315--1319},
  year      = {2009},
  url       = {https://ijcai.org/proceedings/2009/221},
}