Ricardo Ramos Linck, Guilherme Schievelbein, Mara Abel. Conceptual Modeling of Formal and Material Relations Applied to Ontologies. In Marcello Peixoto Bax, Mauricio Barcellos Almeida, Renata Wassermann, editors, Proceedings of the 6th Seminar on Ontology Research in Brazil, Belo Horizonte, Brazil, September 23, 2013. Volume 1041 of CEUR Workshop Proceedings, pages 185-190, CEUR-WS.org, 2013. [doi]