KARPIK, O. State support of agricultural enterprises and its effectiveness. Zeszyty Naukowe SGGW w Warszawie - Problemy Rolnictwa Światowego, [S. l.], v. 3, p. 26–31, 2008. DOI: 10.22630/PRS.2008.3.3. Disponível em: https://prs.sggw.edu.pl/article/view/5909. Acesso em: 22 lis. 2024.