C. SAVA, I. DRĂGAN, A. M. STROE, L. C. PIRĂU, and E. M. PICĂ, “Reducing the Sludge Quantity Produced from Used Water Purification – A Source of Profit”, The Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science, vol. 39, no. 4, pp. 61-63, Dec. 2016.