Ball, H. A., Siribaddana, S. H., Sumathipala, A., Kovas, Y., Glozier, N., Rijsdijk, F., . . . Hotopf, M. (2011). Genetic and environmental contributions to the overlap between psychological, fatigue and somatic symptoms: A twin study in Sri Lanka.

Ball, Harriet A., Sisira H. Siribaddana, Athula Sumathipala, Yulia Kovas, Nick Glozier, Frühling Rijsdijk, Peter McGuffin, and Matthew Hotopf. Genetic and Environmental Contributions to the Overlap between Psychological, Fatigue and Somatic Symptoms: A Twin Study in Sri Lanka. 2011.

Ball, Harriet A., et al. Genetic and Environmental Contributions to the Overlap between Psychological, Fatigue and Somatic Symptoms: A Twin Study in Sri Lanka. 2011.