1
Full text available from Engineering Database: 01/01/2002 to present
Ηλεκτρονική πηγή Επιστημονικό περιοδικό
2
Έκδοση 1956
Full text available from Earth, Atmospheric & Aquatic Science Database: 01/01/2009 to present
Full text available from East Europe, Central Europe Database: 01/01/2009 to present
Full text available from Materials Science Database: 01/01/2009 to present
Ηλεκτρονική πηγή Επιστημονικό περιοδικό