Snellman, G., Melhus, H., Gedeborg, R., Olofsson, S., Wolk, A., Pedersen, N. L., & Michaëlsson, K. (2009). Seasonal Genetic Influence on Serum 25-Hydroxyvitamin D Levels: A Twin Study. Public Library of Science.

Snellman, Greta, Håkan Melhus, Rolf Gedeborg, Sylvia Olofsson, Alicja Wolk, Nancy L. Pedersen, e Karl Michaëlsson. Seasonal Genetic Influence On Serum 25-Hydroxyvitamin D Levels: A Twin Study. Public Library of Science, 2009.

Snellman, Greta, et al. Seasonal Genetic Influence On Serum 25-Hydroxyvitamin D Levels: A Twin Study. Public Library of Science, 2009.