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2. Erhebung zur prophylaktischen Entfernung der Weisheitszahnkeime;Pape;Dtsch Zahnärztl Z,1979
3. Removal of lower third molar germs by lateral trepanation and conventional technique;Finne;Int J Oral Surg,1981
4. Retention and extraction of third molars in Naval personnel;Schroeder;Milit Med,1983
5. A radiographic four-year follow-up study of asymptomatic mandibular third molars in young adults;von Wowen;Int Dent J,1990