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2. Bisatellited extra small metacentric chromosome in new-borns;Friedrich;Clin. Genet.,1974
3. Ein Beitrag zur Frage des “Kopenhagen-Chromosoms” (Syndrom des kleinen metazentrischen Extrachromo-som);Haberlandt;Arzneimittelforsch.,1971
4. A mentally retarded male with karyotype 47, XY,+mar=?i(18p);Nielsen;Ann. Génét.,1974