1. Extraoral force—facts and fallacies;Graber;Am J Orthod,1955
2. An evaluation of cervical traction on the maxilla and the upper first permanent molar;Klein;Angle Orthod,1957
3. Some observations on extraoral treatment;Newcomb;Angle Orthod,1958
4. Evaluation of cervical anchorage force in treatment;Kloehn;Angle Orthod,1961
5. Early or late cervical traction therapy of Class II malocclusion in the mixed dentition;Wieslander;Am J Orthod,1975