Bujanowicz-Haraś, B., and J. Matras. “ECONOMIC EFFECTIVENESS OF MINERAL MIXTURES BALANCING MINERAL NUTRITION OF COWS IN CHOSEN BARNS OF CENTRAL-EAST POLAND”. Acta Scientiarum Polonorum. Oeconomia, vol. 3, no. 2, Dec. 2004, pp. 47-53, https://aspe.sggw.edu.pl/article/view/954.