1. ABNT, Brazilian Association of Technical Standards, 2012. Portland cement - Chemical analysis - Determination of loss at fire. NBR NM 18.
2. ABNT, Brazilian Association of Technical Standards, 1991. Portland Pozolamic Ciment – Sampling of solid materials. NBR 5736.
3. A review on the utilization of fly ash;Ahmaruzzaman;Prog. Energy Combust. Sci.,2010
4. Produção de Matéria Seca e Absorção de Nutrientes pelo Milho em Razão da Saturação por Bases e da Adubação Potássica;Andreotti;Pesqu. Agropecu. Bras.,2000
5. ASTM, American Society for Testing and Materials, 2010. Standard Test Method for Measuring the Exchange Complex and Cation Exchange Capacity of Inorganic Fine-Grained Soils. ASTM D7503-10.