@Article{	  monserrat.ea:entcs:2001,
  author	= {Miquel Monserrat and Francesc Rossell{\'o} and Joan
		  Torrens and Gabriel Valiente},
  journal	= {Electronic Notes in Theoretical Computer Science},
  pages		= {105--112},
  title		= {Hypergraph Rewriting using Conformisms},
  volume	= {2},
  year		= {1995},
  abstract	= {In this paper we study single-pushout transformation in a
		  category of spans, a generalization of the notion of
		  partial morphism. As an application, single-pushout
		  transformation in a category of hypergraphs with a special
		  type of partial morphisms, the conformisms, is presented.
		  In particular, we show the existence of the pushout of any
		  pair of conformisms of hypergraphs with the same source
		  hypergraph, and how to construct one such a pushout.
		  Finally, hypergraph rewriting using conformisms is compared
		  to single-pushout hypergraph rewriting by means of a
		  detailed example.}
}