@InProceedings{Kahl-2009a,
  author = 	 {Wolfram Kahl},
  title = {Collagories for Relational Adhesive Rewriting},
  crossref =  {RelMiCS2009},
  pages = 	 {211--226},
  bibliographies = {RelMiCS, WK},
  DOIURL = {http://dx.doi.org/10.1007/978-3-642-04639-1_15},
  abstract = {We define collagories essentially as
      ``distributive allegories without zero morphisms'',
      and show that they are sufficient
      for accommodating the relation-algebraic approach to graph transformation.
      Collagories closely correspond to the adhesive categories
      important for the categorical DPO approach to graph transformation.
      but thanks to their relation-algebraic flavour
      provide a more accessible and more flexible setting.}
}

@Proceedings{RelMiCS2009,
  title = {{Relations and Kleene Algebra in Computer Science ---
    11th International Conference on Relational Methods in Computer Science,
    and 6th International Conference on Applications of Kleene Algebra,
    RelMiCS/AKA 2009, Doha, Qatar, November 1--5, 2009. Proceedings}},
  booktitle = {Relations and {Kleene} Algebra in Computer Science, {RelMiCS/AKA 2009}},
  LNCSbooktitle = {{RelMiCS/AKA 2009}},
  year = 	 {2009},
  editor = 	 {Rudolf Berghammer and Ali Jaoua and Bernhard M{\"o}ller},
  volume = 	 {5827},
  series = 	 LNCS,
  publisher = Springer,
  LNCSURL = 	 {http://link.springer.de/link/service/series/0558/tocs/t5827.htm}
}