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Citation: Jm. Birkeland et O. Haugejorden, Caries decline before fluoride toothpaste was available: earlier and greater decline in the rural north than in southwestern Norway, ACT ODON SC, 59(1), 2001, pp. 7-13

Authors: Birkeland, JM Haugejorden, O von der Fehr, FR

Citation: Jm. Birkeland et al., Some factors associated with the caries decline among Norwegian children and adolescents: Age-specific and cohort analyses, CARIES RES, 34(2), 2000, pp. 109-116

Authors: Rwenyonyi, CM Birkeland, JM Haugejorden, O

Citation: Cm. Rwenyonyi et al., Assessment of the validity and consequences of different methods of expressing the severity of dental fluorosis in a subject, ACT ODON SC, 58(4), 2000, pp. 148-154

Authors: Awadia, AK Bjorvatn, K Birkeland, JM Haugejorden, O

Citation: Ak. Awadia et al., Weaning food and magadi associated with dental fluorosis in Northern Tanzania, ACT ODON SC, 58(1), 2000, pp. 1-7

Authors: Rwenyonyi, CM Bjorvatn, K Birkeland, JM Haugejordan, O

Citation: Cm. Rwenyonyi et al., Altitude as a risk indicator of dental fluorosis in children residing in areas with 0.5 and 2.5 mg fluoride per litre in drinking water, CARIES RES, 33(4), 1999, pp. 267-274