1. Das digitale Orthophoto und seine Moeglichkeiten;Baehr,1989
2. Cost-Benefit analysis of digital orthophoto technology;Baehr,1991
3. Multiphoto geometrically constrained matching;Baltsavias,1991
4. A digital orthophoto workstation;Baltsavias,1991
5. DOW — a system for generation of digital orthophotos from aerial and SPOT images;Baltsavias;EARSeL — Adv. Remote Sensing,1992