K:son Blomquist, Hans, Agneta Frängsmyr, Olle Hernell, Berndt Stenberg, and Ove Bäck. “Dietary Intake of Vitamin D During the Second Half of Infancy in Swedish Infants”. Food & Nutrition Research 48, no. 4 (January 7, 2008): 173-177. Accessed April 10, 2021. https://foodandnutritionresearch.net/index.php/fnr/article/view/231.