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Banica, Logica and Rosca, Doina and Stefan, Cristian (2007): Virtualization: an old concept in a new approach. Published in: Academy of Economic Studies, Bucharest, Economy Informatics , Vol. 1, No. 1-4 (2007): pp. 118-123.
Dracea, Raluca and Cristea, Mirela and Ciupeanu, Daniela (2008): The efficiency of the green taxes as instruments for Environmental protection.
