1. On the theoretical accuracy of planimetric block triangulation;Ackermann;Photogrammelria,1966
2. Aerial triangulation with independent models: contributions from Institut für Photogrammetrie, Universitat Stuttgart;Ackermann;Nachrichten aus dem Karten- und Vermessungswesen, Reihe,1972a
3. Ackermann , F. 1972b Experience with block triangulation by independent models Proceedings of the 38th annual meeting, American Society of Photogrammetry
4. Combined block adjustment of APR data and independent photogrammetric models;Ackermann;Canadian Surveyor,1972
5. Genauigkeitserwartungen photogrammetrischer Blocke mit grossen Punktmengen;Ebner;Nachrichten aus dem Kartenund Vermessungswesen, Reihe,1971a