1. Bédard Y, Bernier É (2002) Supporting multiple representations with spatial databases view management and the concept of VUEL. In: The joint workshop on multi-scale representation of spatial data, ISPRS WG IV/3, ICA Commission. On Map Generalization, Ottawa, 7–8 July 2002
2. Bédard Y, Pageau J, Caron C (1992) Spatial data modeling: the Modul-R formalism and CASE technology. In: Proceedings of the ISPRS symposium, Washington DC, 1–14 Aug 1992
3. Lecture notes in computer science;Y Bédard,2004
4. Chen PP (1976) The entityrelationship model: towards a unified view of data. ACM Trans Database Syst 1: 9–36
5. Lecture notes in computer science;B David,1993