G. Papastergios, A. Georgakopoulos, J. Fern\'Andez-Turiel, D. Gimeno. LEACHABILITY OF ENVIRONMENTALLY HAZARDOUS ELEMENTS FROM ASHES PRODUCED AFTER LIGNITE COMBUSTION IN AGIOS DIMITRIOS POWER PLANT, NORTHERN GREECE. 5th International Scientific Conference - SGEM2005, 2005, pp. 292-306.