D. OTTEN; H. F. A. VAN DEN WEGHE. Nitrogen and phosphorus management on pig farms in Northwest Germany – nutrient balances and challenges for better sustainability. African Journal of Pig Farming, [S. l.], v. 1, n. 1, p. 1–10, 2013. Disponível em: https://elixirpublishers.in/index.php/ajpf/article/view/611. Acesso em: 14 may. 2025.