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2. Die geschwänzten Menschen;Bartels;Arch Anthropol,1884
3. On the occurrence of tails in man, with a description of the case reported by Dr. Watson;Harrison;Johns Hopkins Hosp Bull,1901
4. On the occurrence of tails in man, with a description of the case reported by Dr. Watson;Harrison;Johns Hopkins Hosp Bull,1901
5. Über congenitale echte Sacraltumoren;Hennig;Beitr Pathol,1900