Carbonari, B. M. T., R. Gettu, L. Agullo, and G. Carbonari. “Analysis of Production Factors in High Performance Concrete”. Semina: Ciências Exatas E Tecnológicas, vol. 24, no. 1, July 2003, pp. 49-58, doi:10.5433/1679-0375.2003v24n1p49.