Helgason, A., Hickey, E., Goodacre, S., Bosnes, V., Stefánsson, K., Ward, R., & Sykes, B. (2001). mtDNA and the Islands of the North Atlantic: Estimating the Proportions of Norse and Gaelic Ancestry. The American Society of Human Genetics.

Helgason, Agnar, Eileen Hickey, Sara Goodacre, Vidar Bosnes, Kári Stefánsson, Ryk Ward, and Bryan Sykes. MtDNA and the Islands of the North Atlantic: Estimating the Proportions of Norse and Gaelic Ancestry. The American Society of Human Genetics, 2001.

Helgason, Agnar, et al. MtDNA and the Islands of the North Atlantic: Estimating the Proportions of Norse and Gaelic Ancestry. The American Society of Human Genetics, 2001.