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Altenburger, Elisabeth; Ingervall, Bengt (1998). The initial effects of the treatment of Class II, division 1 malocclusions with the van Beek activator compared with the effects of the Herren activator and an activator-headgear combination. European journal of orthodontics, 20(4), pp. 389-397. Oxford University Press 10.1093/ejo/20.4.389
