- Girela, E. og fleiri. Indisputable double paternity in dizygous twins. Fertility and Sterility, 1997;67:1159-61. (Skoðað 13.11.2012).
- Understanding Genetics. (Skoðað 13.11.2012).
- Mynd: Meet the billion to one twins who have different fathers - Mirror Online. (Sótt 13.11.2012).
Aðrir spyrjendur eru:
Hafþór Snjólfur Helgason, Jón Sigmundsson, Hafsteinn Heimisson.