1874 October, Robert P. Harris, “Historical and Analogical Record of the Siamese Twins”, in The American Journal of the Medical Sciences, volume 68, page 371:
Operations upon Xiphopagous Twins
1893 May, Saint Louis Medical and Surgical Journal, volume 64, page 305:
Xiphopagous Twins aged three Years
1904 December 31, British Medical Journal, page 1759:
In a work on the Psycho-Physiology of Human Monstrosities, recently published, Drs. N. Vaschide and Cl. Vurpas have embodied the results of a close study of two monsters, one amencephalic, the other xiphopagous.