El Hakimi, Wissam and Beutel, Johannes and Sakas, Georgios (2014):
Particle Path Segmentation: a Fast, Accurate, and Robust Method for Localization of Spherical Markers in Cone-beam CT Projections.
pp. 405-408, de Gruyter, Berlin, Proceedings BMT 2014. 48. DGBMT Jahrestagung, DOI: 10.1515/bmt-2014-5005,
[Conference or Workshop Item]

Beutel, Johannes (2013):
Sub-Pixel Accurate Fiducial Marker Detection and Pose Estimation from CBCT-Data.
Darmstadt, TU, Master Thesis, 2013, [Master Thesis]