Syrjälä-Qvist, L., and J. Setälä. “Formaldehyde Content of Milk: 2.Cows Fed on Grass Silage Preserved With Formaldehyde-Containing Additive and on Formaldehyde-Treated Urea”. Agricultural and Food Science, vol. 54, no. 1, Jan. 1982, pp. 69-76, doi:10.23986/afsci.72091.