@inproceedings{levine-sag:2003,
  author    = {Levine, Robert D. and Sag, Ivan A.},
  title     = {Some empirical issues in the grammar of extraction},
  booktitle = {{Proceedings of the 10th International Conference on Head-Driven Phrase Structure Grammar, Michigan State University}},
  editor    = {Müller, Stefan},
  OPTissn   = {15351793},
  doi       = {10.21248/hpsg.2003.14},
  publisher = {CSLI Publications},
  address   = {Stanford, CA},
  pages     = {236--256},
  year      = {2003},
}

@inproceedings{levine-sag:2003-cr,
  crossref  = {HPSG2003},
  author    = {Levine, Robert D. and Sag, Ivan A.},
  title     = {Some empirical issues in the grammar of extraction},
  doi       = {10.21248/hpsg.2003.14},
  pages     = {236--256},
}

@proceedings{HPSG2003,
  editor    = {Müller, Stefan},
  title     = {{Proceedings of the 10th International Conference on Head-Driven Phrase Structure Grammar, Michigan State University}},
  booktitle = {{Proceedings of the 10th International Conference on Head-Driven Phrase Structure Grammar, Michigan State University}},
  publisher = {CSLI Publications},
  address   = {Stanford, CA},
  OPTissn   = {15351793},
  year      = {2003},
}