1. Abdul-Ghaffar, IL, and J. C. Muhler: Pretreatment of teeth with sodium fluoride application in children. J. dent. Res. 38, 901–904 (1959).
2. Adler, P.: Der Kariesschutz bei Erwachsenen durch natürlich fluorhaltiges Trinkwasser. Dtsch. Zahn-, Mund-u. Kieferheilk. 15, 24–30 (1951).
3. Adler, P., J. Straub, and M. Prorovies: Intra vital uptake of fluorides in the teeth under various conditions. J. dent. Res. 29, 549–555 (1950).
4. Allan, W., and B. W. Nevor: Calcium content of plaque and saliva. Intl. Assoc. Dental Res. 35th Genl. Meeting Abstr. No. 108 (1957).
5. Armstrong, W. D.: Mechanism of fluoride homeostasis. Arch. oral Biol. Suppl. 4, 156–159 (1961).