1. Biographical notes on some famous conjoined twins;Guttmacher;Birth Defects,1967
2. Sibi invicem adnati feliciter separati;Konig;Ephemerid Natur Curios Dec. II, Ann. VIII, Obs,1689
3. Ein Fall Verwachsener Zwillingsfruchle (Xiphopagi) glucklich operative getrennt;Bohm;Virchows Arch,1866
4. Histoire d'une monstre xiphopage;Biaudet;Rev. Med. Suisse Romande,1882
5. El caso de las xifopagus;Doyen;Rev. Critique Med. Chir,1902