1. On strip adjustment with polynomials of higher degree;Ackermann;Photogrammetria,1961
2. A Procedure for Analytical Strip Adjustment;Ackermann;I.T.C. Publ.,1962
3. Some results of an investigation into the theoretical precision of planimetric block adjustment;Ackermann;Photogrammetria,1964
4. Development of strip and block adjustment during 1960–1964;Ackermann;Bull. Soc. Franç. Photogrammétrie,1964
5. Triplets: a basic unit for analytical aerotriangulation;Anderson,1964