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2. The Biddenden Maids: a curious chapter in the history of conjoined twins;Bondeson;J R Soc Med,1992
3. Gemelli invicem adnati feliciter separate;König;Miscellanea Curiosasive Ephemeridum Medico-Physicarum Germanicarum Academiae Imperialis Leopoldinae Naturae Curiosorum,1689
4. Conjoined twins;Spencer,2003