Källestål, C; Matsson, L; (1991) Marginal bone loss in 16-year-old Swedish adolescents in 1975 and 1988. Journal of clinical periodontology, 18 (10). pp. 740-743. ISSN 0303-6979 DOI: https://doi.org/10.1111/j.1600-051X.1991.tb00065.x Full text not available from this repository.