Vegas, I., M. Frías, J. Urreta, and J. T. San José. 2006. “Obtaining a Pozzolanic Addition from the Controlled Calcination of Paper Mill Sludge. Performance in Cement Matrices”. Materiales De Construcción 56 (283):49-60. https://doi.org/10.3989/mc.2006.v56.i283.8.