Olivier Bonin Frederic Rousseaux Digital Terrain Model Computation from Contour Lines: How to Derive Quality Information from Artifact Analysis. 253-268 2005 9 GeoInformatica 3 http://dx.doi.org/10.1007/s10707-005-1284-2 db/journals/geoinformatica/geoinformatica9.html#BoninR05