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Έκδοση 1994
...Electronic journals....
Full text available from ABI/INFORM Global: 03/01/2005 to 06/30/2007
Full text available from Engineering Database: 03/01/2005 to 06/30/2007
Full text available from Environmental Science Database: 03/01/2005 to 06/30/2007
Ηλεκτρονική πηγή Επιστημονικό περιοδικό