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Booij, Johan W; Goeke, Juliane; Bronkhorst, Ewald M; Pancherz, Hans; Ruf, Sabine; Katsaros, Christos (2011). Overjet correction and space closure mechanisms for Class II treatment by extracting the maxillary first molars. Journal of orofacial orthopedics - Fortschritte der Kieferorthopädie, 72(3), pp. 196-203. München: Urban & Vogel 10.1007/s00056-011-0025-4
Casutt, Christoph; Pancherz, Hans; Gawora, Manfred; Ruf, Sabine (2007). Success rate and efficiency of activator treatment. European journal of orthodontics, 29(6), pp. 614-21. Oxford: Oxford University Press 10.1093/ejo/cjm066
