Guttorm Toverud, The Influence of War and Post-War Conditions on the Teeth of Norwegian School Children. I. Eruption of Permanent Teeth and Status of Deciduous Dentition, The Milbank Memorial Fund Quarterly, Vol. 34, No. 4 (Oct., 1956), pp. 354-430
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Guttorm Toverud (1956) studied this question.
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