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References 
1) Hald, A: 
2) Hallert, B: 
3) Roelofs, R: 
4) Roos, W: 
5) Torlegard, 
Statistical Theory with Engineering Applications. 
John Wiley and Sons Inc, New York 1952. 
A new method for the determination of the dis 
tortion and the inner orientation of cameras and 
projectors. 
Photogrammetria, 1954-55, No 3 or ISP Archives 
1956. 
Distortion, principal point, point of symmetry and 
calibrated principal point. 
Photogrammetria, 1950-51, No. 3. 
On the definition of fundamental concepts in 
photogrammetry. 
Photogrammetria, 1951-52, No 3. 
K: On the determination of interior orientation of 
close-up cameras under operational conditions 
using three-dimensional test objects. 
Thesis, Stockholm 1967.