1. European Commission, Report to DGXI, Construction and demolition waste management practices, and their economic impacts, 1999.
2. L. Pereira, S. Jalali, B. Aguiar, Gestão de resíduos de construção e demolição, Workshop Sistemas Integrados de Gestão de Fluxos Específicos de Resíduos, Lisboa, 2004 (in Portuguese).
3. The utilization of Ca-rich and Ca–Si-rich fly ashes in zeolites production;Moutsatsou;Fuel,2006
4. Crystallization of K–L and K–W zeolites from fly-ash;Belardi;Resour. Conserv. Recycl.,1998
5. Synthesis of zeolites by alkaline activation of ferro-aluminum fly ash;Querol;Fuel,1995