Pieter Van Gorp Hans Schippers Dirk Janssens Copying Subgraphs Within Model Repositories. 133-145 2008 211 Electr. Notes Theor. Comput. Sci. http://dx.doi.org/10.1016/j.entcs.2008.04.036 db/journals/entcs/entcs211.html#GorpSJ08