Study of Utilization of Waste Paper Sludge Ash (WPSA) for Soil Stabilization. International Journal of Food and Nutritional Sciences, [S. l.], v. 11, n. 6, p. 2846–2856, 2022. Disponível em: https://www.ijfans.org/index.php/Journal/article/view/6259. Acesso em: 10 aug. 2026.