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3. En variant av Eggens filmholder til bruk i bakre molaromrȧder (English Summary);Beyer-Olsen;Nor. Tannlaegeforen. Tid,1979
4. Sequential Reproduction of Intraoral radiographs;Silver;Can. Dent. Assoc. J,1974
5. Periodic Identical Intraoral Radiographs;Refshauge;Oral Surg,1978