1
Έκδοση 1994
Full text available from ABI/INFORM Global: 05/01/1998 to present
Full text available from Research Library: 05/01/1998 to present
Ηλεκτρονική πηγή Περιοδική έκδοση
2
Έκδοση 2000
Full text available from Computer Science Database: 12/01/1997 to present
Full text available from ABI/INFORM Global: 09/01/2000 to present
Full text available from Advanced Technologies & Aerospace Database: 09/01/2000 to present
Ηλεκτρονική πηγή Επιστημονικό περιοδικό