Dzun, P., and W. Musiał. “THE IMPACT OF AGRARIAN FRAGMENTATION ON THE DYNAMICS OF REGIONAL CHANGES IN DAIRY CATTLE BREEDING IN THE YEARS 1990-2010”. Acta Scientiarum Polonorum. Oeconomia, vol. 13, no. 1, Mar. 2014, pp. 29-43, https://aspe.sggw.edu.pl/article/view/507.