Kemppinen, N., A. Meller, K. Mauranen, T. Kohila, and T. Nevalainen. “Work for Food – A Solution to Restricting Food Intake in Group Housed Rats?”. Scandinavian Journal of Laboratory Animal Science, vol. 35, no. 2, Dec. 2008, pp. 81-90, doi:10.23675/sjlas.v35i2.143.