1. Cephalometric analysis of treatment with cervical anchorage;Blueher;Angle Orthod,1959
2. Extraoral force—facts and fallacies;Graber;Am J Orthod,1955
3. A cephalometric evaluation of nonextraction cervical headgear treatment in Class II malocclusions;Hubbard;Angle Orthod,1994
4. Effects of cervical anchorage during and after treatment: an implant study;Melsen;Am J Orthod,1978
5. Directional forces;Merrifield;Am J Orthod,1970