1. Combined adjustment of airborne navigation data and photogrammetric blocks;Ackermann;International Archives of Photogrammetry and Remote Sensing,1988
2. Operational rules and accuracy models for GPS-aerotriangulation;Ackermann;Ibid,1992
3. Application of GPS for aerial triangulation;Ackermann;Photogrammetric Engineering and Remote Sensing,1993
4. GPS-supported aerial triangulation-state of the art;Blankenberg;The Photogrammetric Journal of Finland,1993