Szmidt, K., Kasztelan, A., Kierepka, M., & Samborski, A. (2016). DIVERSIFICATION IN THE INCOME LEVELS OF EU FARM HOLDINGS SPECIALIZING IN THE PRODUCTION OF MILK. Acta Scientiarum Polonorum. Oeconomia, 15(1), 133–143. Retrieved from https://aspe.sggw.edu.pl/article/view/409