the Institute of Agricultural and Food Economics – National Research Institute, Economics of Farm Holdings Department; ul. Świętokrzyska 20, 00-002 Warsaw, Poland
the Institute of Agricultural and Food Economics – National Research Institute, Economics of Farm Holdings Department; ul. Świętokrzyska 20, 00-002 Warsaw, Poland
the Institute of Agricultural and Food Economics – National Research Institute, Economics of Farm Holdings Department; ul. Świętokrzyska 20, 00-002 Warsaw, Poland
the Institute of Agricultural and Food Economics – National Research Institute, Economics of Farm Holdings Department; ul. Świętokrzyska 20, 00-002 Warsaw, Poland
the Institute of Agricultural and Food Economics – National Research Institute, Economics of Farm Holdings Department; ul. Świętokrzyska 20, 00-002 Warsaw, Poland