Mark McKenney Alejandro Pauly Reasey Praing Markus Schneider Local Topological Relationships for Complex Regions. 203-220 2007 conf/ssd/2007 SSTD http://dx.doi.org/10.1007/978-3-540-73540-3_12 db/conf/ssd/sstd2007.html#McKenneyPPS07