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Έκδοση 2008
Full text available from Computer Science Database: 11/01/2001 to 03/31/2010
Full text available from ABI/INFORM Global: 09/01/2008 to 03/31/2010
Full text available from Advanced Technologies & Aerospace Database: 09/01/2008 to 03/31/2010
Ηλεκτρονική πηγή Επιστημονικό περιοδικό