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Häsler, Rudolf Ulrich; Schmid, George; Ingervall, Bengt; Gebauer, Urs (1997). A clinical comparison of the rate of maxillary canine retraction into healed and recent extraction sites—a pilot study. European journal of orthodontics, 19(6), pp. 711-719. Oxford University Press 10.1093/ejo/19.6.711
Dahlquist, Anders; Gebauer, Urs; Ingervall, Bengt (1996). The effect of a transpalatal arch for the correction of first molar rotation. European journal of orthodontics, 18(3), pp. 257-267. Oxford University Press 10.1093/ejo/18.3.257