Claudia Zepeda Christine Solnon David Sol Planning Operation: An Extensio'n of a Geographical Information System. 2004 conf/lanmr/2004 LA-NMR http://sunsite.informatik.rwth-aachen.de/Publications/CEUR-WS//Vol-92/claudia.pdf db/conf/lanmr/lanmr2004.html#ZepedaSS04