1. Ultrasonic Dental Cutting Instrument I;Nielson;J. Am. Dent. Assoc,1955
2. Ultrasonic Dental Cutting Instrument II;Nielson;J. Am. Dent. Assoc,1955
3. The Use of Ultrasonics in Root Canal Therapy and Root Resection;Richman;J. Dent. Med,1957
4. New Method Machines: Sintered Carbides, Sintered Borides, Hardened Tool Steels;Cohan;J. Metals,1951
5. Hard, Brittle Materials Machined Using Ultrasonic Vibrations;Kelly;Materials and Methods,1951