User Interaction in a Sketch-Based GIS User Interface. - Andreas D. Blaser (COSIT, 1997)

A Visual Tool for Querying Geographic Databases. - Andreas D. Blaser; Max J. Egenhofer (Advanced Visual Interfaces, 2000)

A study of people's sketching habits in GIS. - Andreas D. Blaser (Spatial Cogn. Comput., 2000)

Query Pre-processing of Topological Constraints: Comparing a Composition-Based with Neighborhood-Based Approach. - M. Andrea Rodríguez; Max J. Egenhofer; Andreas D. Blaser (SSTD, 2003)