Radwan, A., & WadoĊ„, A. (2009). PRODUCTION AND ECONOMIC DIVERSIFICATION OF PIG-KEEPING FAMILY FARMS WITH DIFFERENT ARABLE LAND AREA. Journal of Agribusiness and Rural Development, 13(3), 187-195. Retrieved from http://www1.up.poznan.pl/jard/index.php/jard/article/view/892