1. Handpiece sterilization in general practice;Besford,1974
2. Bacterial colonization of dental units and the nasal flora of dental personnel;Clark,1974
3. Comfort M. B. (1980) Personal communication.
4. Bacteriological investigation of the aerosol from ultrasonic scalers;Holbrook;Br. Dent. J.,1978
5. Microbial aggregate contamination of water lines in dental equipment and its control;Kelstrup;Acta Pathol. Microbiol. Scand. (B),1977