Robert Jeansoulin Odile Papini Henri Prade Steven Schockaert Methods for Handling Imperfect Spatial Information 256 2010 http://dx.doi.org/10.1007/978-3-642-14755-5 978-3-642-14754-8 Springer Studies in Fuzziness and Soft Computing db/series/sfsc/Jeansoulin10.html