Sobczyński, T. “The Results of Farms from LFA Compared With Others - Are We in Danger of Giving up the Production in Unfavourable Environment?”. Journal of Agribusiness and Rural Development, Vol. 24, no. 2, Dec. 2012, pp. 243-51, http://www1.up.poznan.pl/jard/index.php/jard/article/view/536.