ARTALE, Alessandro, KEET, C. Maria. Essential, mandatory, and shared parts in conceptual data models. In: Innovations in information systems modeling: methods and best practices. IGI Global, Advances in Database Research Series, Halpin, T. A., Proper, H. A., Krogstie, J., ed. 2008, s. 17-52.
Preprint dostupný z: http://www.meteck.org/files/ISmodelBookPartsAK08preprint.pdf