Legal atlas: access to legal sources through maps. - Radboud Winkels; Alexander Boer; Erik Hupkes (ICAIL, 2007)

An Ontology for Spatial Regulations. - Tom M. van Engers; Erik Hupkes; Radboud Winkels; Alexander Boer (Computable Models of the Law, Languages, Dialogues, Games, Ontologies, 2008)

Reasoning with spatial plans on the semantic web. - Rinke Hoekstra; Radboud Winkels; Erik Hupkes (ICAIL, 2009)

Normative reasoning with geo information. - Radboud Winkels; Rinke Hoekstra; Erik Hupkes (COM.Geo, 2010)

Spatial Planning on the Semantic Web. - Rinke Hoekstra; Radboud Winkels; Erik Hupkes (Trans. GIS, 2010)