1. Agatzini-Leonardou, S., Dimaki, D., 1994. Recovery of nickel and cobalt from low-grade nickel oxide ores by the technique of extraction in heaps using dilute sulphuric acid at ambient temperature. Greek Patent GR1001555, 22 March 1994.
2. Agatzini-Leonardou, S., Zafiratos, I.G., Oustadakis, P.T., 2000. Process for the removal of aluminium and/or chromium from nickel and/or cobalt sulphate solutions at atmospheric pressure. Greek Patent GR1003419, 01 September 2000.
3. Agatzini-Leonardou, S., Dimaki, D., 2001. Method for obtaining nickel and cobalt from oxidised nickel and cobalt ore by extraction in heaps using dilute sulphuric acid prepared by using sea water, at ambient temperature. Greek Patent GR1003569, 23 April 2001.
4. Hydrometallurgical process for the separation and recovery of nickel from sulphate heap leach liquor of nickeliferrous laterite ores;Agatzini-Leonardou;Minerals Engineering,2009
5. Statistics for Experiments,1978