1
Έκδοση 1998
Full text available from Earth, Atmospheric & Aquatic Science Database: 01/01/2012 to present
Full text available from East Europe, Central Europe Database: 01/01/2012 to present
Full text available from Research Library: 01/01/2012 to present
Ηλεκτρονική πηγή Περιοδική έκδοση
2
Full text available from ABI/INFORM Global: 01/01/2011 to present
Full text available from East Europe, Central Europe Database: 01/01/2011 to present
Ηλεκτρονική πηγή Επιστημονικό περιοδικό
3
Έκδοση 1999
Full text available from East Europe, Central Europe Database: 01/01/2010 to present
Full text available from Research Library: 01/01/2010 to present
Ηλεκτρονική πηγή Επιστημονικό περιοδικό