Varis, E., U. Peltola, and R. Kauppila. “Seed Yield and Seed Quality of Subterranean Clover (Trifolium Subterraneum L.) in Growing Conditions of Finland”. Agricultural and Food Science 62, no. 3 (July 1, 1990): 221–226. Accessed November 23, 2024. https://journal.fi/afs/article/view/72928.