1. Burke, L.W. Oral Medicine, Philadelphia, J. B. Lippincott Co., 1962, p. 204.
2. Further Studies of the Calcium and Phosphorus Content of Resting and Activated Saliva of Caries-Free and Caries-Active Individuals
3. Rovelstad, G.H. Salivary Components and Their Relationship to Oral Disease. In Environmental Variables in Oral Disease, Kreshover, S. and Mcclure, F. J. editors. Washington, D.C. American Association for the Advancement of Science, 1966 , p. 75-88.