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Full text available from Earth, Atmospheric & Aquatic Science Database: 10/01/1997 to 10/31/1998
Full text available from Engineering Database: 10/01/1997 to 10/31/1998
Full text available from Military Database: 10/01/1997 to 10/31/1998
Full text available from Research Library: 10/01/1997 to 10/31/1998
Κυβερνητικό Έγγραφο Ηλεκτρονική πηγή Επιστημονικό περιοδικό