See Ashok Samal, Sharad Seth, and Kevin Cueto, "A feature-based approach to conflation of geospatial sources", in International Journal of Geographical Information Science, (18)5, July-August 2004, p. 459, and Sandrine Balley, Christine Parent, and Stefano Spaccapietra, "Modelling geographic data with multiple representations", in International Journal of Geographical Information Science, (18)4, June 2004, p. 327.