Syrjälä, L., E. Poutiainen, and V.-H. Koskela. “Untreated and Formaldehyde Treated Skimmilk Powder As a Protein Supplement for Dairy Cows”. Agricultural and Food Science, vol. 50, no. 2, Mar. 1978, pp. 155-6, doi:10.23986/afsci.71968.