Saastamoinen, Markku, and Johanna Juusela. “Influence of Dietary Supplementation on Serum Vitamin A and D Concentrations and Their Seasonal Variation in Horses”. Agricultural and Food Science 1, no. 5 (September 1, 1992): 477–482. Accessed May 18, 2024. https://journal.fi/afs/article/view/72460.