Zieliński, M. 2017. EFFICIENCY OF FIELD FARMS SITUATED IN LESS-FAVORED AREAS (LFAS) AND BESIDE IN DOLNOŚLĄSKIE AND OPOLSKIE VOIVODESHIPS IN 2011–2013. Journal of Agribusiness and Rural Development. 44, 2 (Dec. 2017), 481–488. DOI:https://doi.org/10.17306/J.JARD.2017.00315.