ALTERNATIVES FOR SEWAGE SLUDGE FERTILIZERS ACTIVITYIN WILLOW. Research Bulletins of the Faculty of Economic Sciences, [S. l.], v. 1, n. 18, p. 35–47, 2021. Disponível em: https://www.ezeszyty.wne.tu.koszalin.pl/index.php/zeszyty/article/view/178. Acesso em: 11 dec. 2025.