1. 1. JM Jumber, and HF Anderson, An Atlas of Overdentures and Attachments . Chicago, Berlin, Rio de Jenerio and Tokyo: Quintessence Publishing Co. Inc.; 1981 : 255 .
2. A new telescopic crown system using a soldered horizontal pin for removable partial dentures
3. Telescope retainers for removable partial dentures
4. 5. K Korber, Konuskronen. Das Rationelle Teleskopsystem Einfuhrung in Klinik und Technik . Heidelberg: Dr. Alfred Huthig Verlag GmbH, Printed in Germany; 1988 : 76 .