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2. Calibration of high-resolution electronic autocollimators against an angle comparator;Just;Metrologia,2003
3. Measurement of angle and flatness deviations of polygon prism faces using a phase-shifting interferometer;Probst;VDI-Reports,1994
4. Working Group 5.23, Angle Metrology. Available from: .
5. Modern Theodolites and Levels;Cooper,1987