A. T. Tesfa, M. Tuori, L. Syrjälä-Qvist, and K. Kaustell, “Effects of partial replacement of barley with rapeseed oil or birch wood in comparison to barley and oats on the performance and blood metabolites of lactating cows”, AFSci, vol. 1, no. 3, pp. 255–265, May 1992.