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E. Siems
"New method for marking and control of railroad lines/tracks (In German)", Proc. SPIE 2252, Optical 3D Measurement Techniques II: Applications in Inspection, Quality Control, and Robotics, (1 March 1994); https://doi.org/10.1117/12.169827
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E. Siems, "New method for marking and control of railroad lines/tracks (In German)," Proc. SPIE 2252, Optical 3D Measurement Techniques II: Applications in Inspection, Quality Control, and Robotics, (1 March 1994); https://doi.org/10.1117/12.169827