1. Ontological Foundations for Structural Conceptual Models;Guizzardi,2005
2. An ontology of data modelling languages: a study using a common-sense realistic ontology;Milton,2008
3. Ambiguity in natural language: an investigation of certain problems in its linguistic description;Kooij;Found. Lang.,1973
4. Ontological evaluation of the ITU-T recommendation G.805;Barcelos,2011
5. Ontological analysis of reference models;Fettke,2005