Valle, Otto, Kirsti Äyräväinen, and C. S. Garrison. “Varietal Changes in Two Finnish Alsike Clover Varieties Grown for Seed in the USA”. Agricultural and Food Science 44, no. 4 (December 1, 1972): 266–278. Accessed July 22, 2024. https://journal.fi/afs/article/view/71832.