3
Full text available from Research Library: 01/01/2004 to 01/31/2012
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4
Έκδοση 1946
Full text available from Research Library: 01/01/1992 to 01/31/2018
Ηλεκτρονική πηγή Επιστημονικό περιοδικό
5
Full text available from East Europe, Central Europe Database: 01/01/2010 to 01/31/2013
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Full text available from Research Library: 01/01/2010 to 01/31/2013
Ηλεκτρονική πηγή Περιοδική έκδοση
6
Full text available from Earth, Atmospheric & Aquatic Science Database: 07/01/2012 to present
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7
Έκδοση 1968
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Full text available from Research Library: 01/01/2015 to present
Ηλεκτρονική πηγή Περιοδική έκδοση
8
Έκδοση 2008
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Ηλεκτρονική πηγή Περιοδική έκδοση
9
Έκδοση 1980
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12
Full text available from Linguistics Database: 01/01/2007 to present
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13
Έκδοση 1991
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14
Full text available from Research Library: 12/01/2017 to present
Ηλεκτρονική πηγή Επιστημονικό περιοδικό
15
Έκδοση 2006
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Ηλεκτρονική πηγή Επιστημονικό περιοδικό
17
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18
Full text available from PRISMA Database with HAPI Index: 01/01/2002 to 01/31/2002
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19
Έκδοση 2006
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20
Έκδοση 1996
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Ηλεκτρονική πηγή Επιστημονικό περιοδικό