1. Morrey LW, Nelsen RJ (1970) Dental science handbook. US Department of Health, Education and Welfare, Washington, DC, p 46
2. Leach SA (1973) Dental calculus. In: Zipkin I (ed) Biological mineralization. Wiley-Interscience, New York, p 587
3. Jenkin GN (1978) The physiology and biochemistry of the mouth, 4th ed. Blackwell Scientific Publications, Oxford
4. Sundberg M, Friskopp J (1985) Crystallography of supragingival and subgingival human dental calculus. Scand J Dent Res 93:30–38
5. Gaffar A, Moreno E, Muhlemann HR, Niles HP (1983) Effects of EDITEMPA on dental calculus and caries formation. Calcif Tissue Int 35:362–365