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3. K. KoRBER(1983 ) Konuskronen Das rationelle Teleskopsystem Einfuhrung in Klinik und Technik , pp. 64 -90 , 5. Aufl. Dr. Alfred Huthig Verlag Heidelberg.
4. The measurement of forces transmitted to abutment teeth of removable partial dentures
5. Longitudinal study on forces transmitted from denture base to retainers of lower free-end saddle dentures with Aker's clasps