Kulawik, Jacek ; Płonka, Renata ; Wieliczko, Barbara Kulawik J., Płonka R., Wieliczko B., 2021: Changes in The Income Situation of Agricultural Holdings in The Light of The Polish FADN Observations from 2004-2018, "Zagadnienia Ekonomiki Rolnej / Problems of Agricultural Economics", nr 4, s. 108-134..
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2020