1. Atlas und Grundis der Zahnärztlichen Orthopädie;Herbst,1910
2. Guiding alveolar growth and eruption of teeth to reduce treatment time and produce a more balanced denture and face;Kloehn;Angle Orthod,1947
3. Extra-oral force—facts and fallacies;Graber;Am J Orthod,1955
4. The influence of extraoral traction;Poulton;Am J Orthod,1967
5. A computerized appraisal of high-pull headgear;Watson;Am J Orthod,1972