1
Έκδοση 1990
Full text available from Arts & Humanities Database: 01/01/2014 to present
Full text available from East Europe, Central Europe Database: 01/01/2014 to present
Full text available from Research Library: 01/01/2014 to present
Ηλεκτρονική πηγή Επιστημονικό περιοδικό
2
Full text available from ABI/INFORM Global: 07/01/2010 to present
Full text available from East Europe, Central Europe Database: 07/01/2010 to present
Ηλεκτρονική πηγή Επιστημονικό περιοδικό
3
Έκδοση 1955
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Ηλεκτρονική πηγή Επιστημονικό περιοδικό
4
Full text available from East Europe, Central Europe Database: 01/01/2012 to present
Ηλεκτρονική πηγή Επιστημονικό περιοδικό