Digital Cliff Drawing for Topographic Maps: Traditional Representations by Means of New Technologies. - Lorenz Hurni; Tobias Dahinden; Ernst Hutzler (Cartogr. Int. J. Geogr. Inf. Geovisualization, 2001)

Self-Adjusting Legends for Proportional Symbol Maps. - Bernhard Jenny; Ernst Hutzler; Lorenz Hurni (Cartogr. Int. J. Geogr. Inf. Geovisualization, 2009)