1. Tweed profile;Angle;J Charles H. Tweed Int Found,1988
2. Clinical orthodontics;Tweed,1966
3. Directional forces;Merrifield;Am J Orthod,1970
4. The systems of directional force;Merrifield;J Charles H. Tweed Int Found,1982
5. Rigid implant anchorage to close a mandibular first molar extraction site;Roberts;J Clin Orthod,1994