Baijotstroobants, J., & Vreven, J. (1980). Invivo Uptake of Topically Applied Fluoride By Human Dental Enamel. Archives of Oral Biology : a multidisciplinary journal of oral & craniofacial sciences, 25(8-9), 617-621. https://doi.org/10.1016/0003-9969(80)90077-1 (Original work published 1980)