1. Duley, W.W. and G. Kinsman (1997). Method and apparatus for real-time control of laser processing of materials, US Patent Number 5659479.
2. Finding structure in time;Elman;Cognitive Science,1990
3. In-situ Inderschung des Harestofftransportes beim Laserstrahl-Dispergieren mittels Hochgeschwindigkeits-Radioskopie;Haferkamp;Metal,1997
4. Halir, R. and J. Flusser (2000). Numerically stable direct least squares fitting of ellipses.
5. Multiple View Geometry in Computer Vision;Hartley,2003