Turesky, S., Renstrup, G., and Glickman, I.The Effect of Local Environmental Changes on Calculus Formation. J. dent. Res., 40:752, 1961.
2.
SchroederH.E. , Salvia Viscosity and Calculus Formation in Man. Arch. oral Biol., 9:65-74, 1964.
3.
Mandel, I.D., and Thompson, R.H.Salivary Composition in Heavy Calculus Formers and Non-Formers. IADR Abstracts, 295, 110, 1965.
4.
Ennever, J., Sturzenberger,0. P., and RADIKE, A. W. The Calculus Surface Index Method for Scoring Clinical Calculus Studies. J. Periodont., 32: 54-57, 1961.
5.
Fiske, C.H., and Subbarow, Y.The Colorimetric Determination of Phosphorus. J. Biol. Chem. , 66: 375-400, 1925.
