1. Principles and results of investigations on increased muscle activity following insertion of the Andresen-Haupl orthodontic apparatus;Eschler;Zahnarztl Welt Zahnarztl Reform Zwr,1951
2. A longitudinal clinical and cephalometric study of 50 malocclusion cases treated with activator appliances;Ahlgren;Trans Eur Orthod Soc,1972
3. The Activator in Interceptive Orthodontics;Harvold,1974
4. Function of masticatory muscles during the initial phase of activator treatment;Ingervall;Eur J Orthod,1986
5. Some effects of activator treatment on the mandible and the midface;Woodside;Trans Eur Orthod Soc,1973