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Full text available from ABI/INFORM Global: 02/01/1999 to 1 year ago
Full text available from Advanced Technologies & Aerospace Database: 02/01/1999 to 1 year ago
Full text available from Computer Science Database: 02/01/1999 to 1 year ago
Ηλεκτρονική πηγή Επιστημονικό περιοδικό