Bibby, B.G.: The Formation of Salivary Calculus, D. Cosmos. 77: 668, 1935.
2.
Bray, J., and King, E.J.: The Phosphatase Reaction as an Aid to the Identification of Micro-organisms Using Phenolphthalein Phosphate as Substrate, J. Path. and Bact. 55: 315, 1943.
3.
Citron, S.R. : The Role of Actinomyces israeli in Salivary Calculus Formation, J. D. Res. 24: 87, 1945.
4.
Ennever, J., Robinson, H.B.G., and Kitchin, P.C. : Actinomyces and the Dentobacterial Plaque, J. D. Res. 30: 88, 1951.
5.
Hodge, H.C., and Wah Leung, S.: Calculus Formation, J. Periodont. 21: 211, 1950.
6.
Jacobsen, N. , and Kesel, R.G.: Salivary Ammonia and Its Correlation to Dental Calculus, J. D. Res. 29: 364, 1950.
7.
King, E.J.: Preparation of Phenolphthalein Phosphate, J. Path. & Bact . 55: 311, 1947.
8.
Naeslund, C. : Studies of Tartar Formation, Acta. Path. Microbiol. Scandinav. 3: 637, 1926.
9.
Prinz, H.: The Origin of Salivary Calculus, D. Cosmos. 63: 231, 1921.
10.
Rosebury, T. : The Parasitic Actinomycetes and Other Filamentous Microorganisms of the Mouth, Bact. Rev. 8: 189, 1944.
11.
Tenenbaum, B., and Karshan, M.: The Composition and Formation of Salivary Calculus, J. Periodont. 15: 72, 1944.
