Media type: E-Article Title: Conceptual Modeling – ER ’98: The Troll Approach to Conceptual Modelling: Syntax, Semantics, and Tools Contributor: Grau, Antonio; Filipe, Juliana Küster; Kowsari, Mojgan; Eckstein, Silke; Pinger, Ralf; Ehrich, Hans-Dieter imprint: Springer Berlin Heidelberg, 1998 Published in: Conceptual Modeling – ER ’98 Language: Not determined DOI: 10.1007/978-3-540-49524-6_22 ISSN: 0302-9743; 1611-3349 Origination: Footnote: