@Proceedings{HeinzICGI2012,
  booktitle = {Proceedings of the Eleventh International Conference on Grammatical Inference},
  editor = {Jeffrey Heinz and Colin de la Higuera and and Tim Oates},
  publisher = {JMLR Workshop and Conference Proceedings},
  volume = {21},
  year = {2012},
  address = {University of Maryland, College Park, MD, USA},
  month = {5--8 September},
  shortname = {ICGI 2012},
  sections = {preface=Preface|default=Accepted Papers}
}

@Proceedings{HeinzICGI2012,
  booktitle = {Proceedings of the Eleventh International Conference on Grammatical Inference},
  editor = {Heinz, Jeffrey and de la Higuera, Colin and Oates, Tim},
  publisher = {JMLR Workshop and Conference Proceedings},
  volume = {21},
  year = {2012},
  address = {University of Maryland, College Park, MD, USA},
  month = {5--8 September},
  shortname = {ICGI 2012},
  sections = {preface=Preface|default=Accepted Papers}
}

Remove extra and in editor field
Remove extra and in editor field
