KOTOPANOVA, Yanka; SLAVOV, Dimitar. Nitrification Ability of Slow Releasing Nitrogen Fertilizers. Bulgarian Journal of Crop Science, Sofia, BG, v. 51, n. 6, p. 36–38, 2014. Disponível em: https://agriacad.eu/ojs/index.php/bjcs/article/view/3719.. Acesso em: 11 oct. 2026.