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Booij, Johan Willem; Goeke, Juliane; Bronkhorst, Ewald Maria; Katsaros, Christos; Ruf, Sabine (2013). Class II treatment by extraction of maxillary first molars or Herbst appliance: dentoskeletal and soft tissue effects in comparison. Journal of orofacial orthopedics - Fortschritte der Kieferorthopädie, 74(1), pp. 52-63. Springer 10.1007/s00056-012-0112-1
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
