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2.
Gilbert, R.H.: pH Determination of the Periodontal Pocket, M.S.D. Thesis, Northwestern University Dental School, Chicago, Ill ., 1951.
3.
Paulsen, A.G.: The pH of the Periodontal Pocket and Its Significance, M.S.D. Thesis, Northwestern University Dental School, Chicago, Ill ., 1950.
4.
Berg, M., Burrill, D.Y., and Fosdick, L.S.: Chemical Studies in Periodontal Disease. IV. Putrefaction Rates as Index of Periodontal Disease, J. D. Res. 26: 67, 1947.