1. Bédard, Y., Larrivée, S.: Modeling with pictogrammic languages. In: Shekhar, S., Xiong, H. (eds.) Encyclopedia of GIS, pp. 716–725. Springer, New York (2008)
2. Bédard, Y., Paquette, F.: Extending entity/relationship formalism for spatial information systems. In: Proc. 9th Int. Symp. on Computer-Assisted Cartography, pp. 818–827. Auto-Carto, Baltimore, USA (1989)
3. Belussi, A., Negri, M., Pelagatti, G.: Geouml: a geographic conceptual model defined through specialization of iso tc211 standards. In: 10th EC GI & GIS Workshop, ESDI State of the Art, pp. 1–10. GIS European Commission, Warsaw (2004)
4. Borges, K.A.V., Davis, C.A., Laender, A.H.F.: Omt-g: An object-oriented data model for geographic applications. GeoInformatica 5(3), 221–260 (2001)
5. Brodeur, J., Badard, T.: Modeling with iso 191xx standards. In: Shekhar, S., Xiong, H. (eds.) Encyclopedia of GIS, pp. 705–716. Springer, New York (2008)