1. Histochemical observations on enamel and dentine undergoing carious destruction
2. Posner, A.S. The Nature of the Inorganic Phase in Calcified Tissues. In Calcification in Biological Systems, ed. R. F. Sognnaes, p. 373. (Publication No. 64.) Washington, D.C.: American Association for the Advancement of Science , 1960.
3. Frank, R.M., Sognnaes, R.F., and Kern, R. Calcification of Dental Tissues with Special Reference to Enamel Ultrastructure . In Calcification in Biological Systems, p. 163.
4. Studies on Mineralized Dental Tissues: II. Microradiography as a method for studying dental tissues and its application to the study of caries