Dvortsin, Dima P., Ye, Qingsong, Pruim, Gerard J., Dijkstra, Pieter U., and Ren, Yijin (2011) Reliability of the integrated radiograph-photograph method to obtain natural head position in cephalometric diagnosis. Angle Orthodontist, 81 (5). pp. 889-894.

Dvortsin, D.P., Sandham, A., Pruim, G.J., and Dijkstra, P.U. (2008) A comparison of the reproducibility of manual tracing and on-screen digitization for cephalometric profile variables. European Journal of Orthodontics, 30 (6). pp. 586-591.