3) LeCompte, E.J. and Doyle, T.E.: Oral fluoride retention following various topical application techniques in children, J. Dent. Res., 61 (12); 1397-1400, 1982.
5) Ekstrand, J., Koch, G., Lindgren, L.E. and Petersson, L.G.: Pharmacokinetics of fluoride gels in children and adults, Caries Res., 15; 213-220, 1981.