1. The theoretical concept underlying treatment with functional correctors;Fra¨nkel;Trans. Eur. Orthod. Soc.,1966
2. The “activator's” mode of action;Herren;Am. J. Orthod.,1959
3. A longitudinal clinical and cephalometric study of 50 malocclusion cases treated with activator appliances;Ahlgren;Trans. Eur. Orthod. Soc.,1972
4. Angle Class II, Division 1 malocclusion treated by the Andresen method;Trayfoot;Br. Dent. J.,1968
5. Possibilities of functional treatment;Hausser;Trans. Eur. Orthod. Soc.,1969