Denisa Ficai* and Anton Ficai Pages 4 - 5 ( 2 )
Politehnica University of Bucharest, Faculty of Applied Chemistry and Material Science; 1-7 Polizu Str., 011061 Bucharest, Politehnica University of Bucharest, Faculty of Applied Chemistry and Material Science; 1-7 Polizu Str., 011061 Bucharest