1. S. Agatzini-Leonardou, D. Dimaki, Recovery of nickel and cobalt from low-grade nickel oxide ores by heap leaching with dilute sulfuric acid at room temperature, Greek Patent, No: 910100234, 1991.
2. S. Agatzini-Leonardou, D. Dimaki, Method for extraction of nickel and/or cobalt from nickel and/or cobalt oxide ores by heap leaching with a dilute sulfuric acid solution, prepared from sea water, at ambient temperature, Greek Patent, No: 1003569, 2000.
3. S. Agatzini-Leonardou, P. Oustadakis, J. Zafiratos, Removal of aluminum and chromium from nickel–cobalt sulfate solutions, Greek Patent, No: 1003419, 1999.
4. Method 1311, Toxicity characteristic leaching procedure, Test Methods for Evaluating Solid Wastes Physical/Chemical Methods;U.S. E.P.A.,1994
5. Incorporation of V, Zn and Pb into the crystalline phases of portland clinker;Andrade;Cement and Concrete Research,2003