@incollection{Kle05, author = {Klempien-Hinrichs, R. and Kreowski, H.-J. and Kuske, S.}, title = {Rule-Based Transformation of Graphs and the Product Type}, publisher = {IGI Global}, year = {2005}, booktitle = {Transformation of Knowledge, Information and Data}, editor = {van Bommel, P.}, doi = {10.4018/978-1-59140-527-6.ch002}, pages = {29-51} }