@inproceedings{branco-costa:2006,
  author    = {Branco, António and Costa, Francisco},
  title     = {Noun ellipsis without empty categories},
  booktitle = {{Proceedings of the 13th International Conference on Head-Driven Phrase Structure Grammar, Varna}},
  editor    = {Müller, Stefan},
  OPTissn   = {15351793},
  doi       = {10.21248/hpsg.2006.5},
  publisher = {CSLI Publications},
  address   = {Stanford, CA},
  pages     = {81--101},
  year      = {2006},
}

@inproceedings{branco-costa:2006-cr,
  crossref  = {HPSG2006},
  author    = {Branco, António and Costa, Francisco},
  title     = {Noun ellipsis without empty categories},
  doi       = {10.21248/hpsg.2006.5},
  pages     = {81--101},
}

@proceedings{HPSG2006,
  editor    = {Müller, Stefan},
  title     = {{Proceedings of the 13th International Conference on Head-Driven Phrase Structure Grammar, Varna}},
  booktitle = {{Proceedings of the 13th International Conference on Head-Driven Phrase Structure Grammar, Varna}},
  publisher = {CSLI Publications},
  address   = {Stanford, CA},
  OPTissn   = {15351793},
  year      = {2006},
}