1
Έκδοση 1982
Full text available from Earth, Atmospheric & Aquatic Science Database: 03/01/1997 to 12/31/2017
Full text available from Science Database: 03/01/1997 to 12/31/2017
Ηλεκτρονική πηγή Επιστημονικό περιοδικό
2
Έκδοση 1975
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Ηλεκτρονική πηγή Επιστημονικό περιοδικό
4
Έκδοση 1999
Full text available from ABI/INFORM Global: 01/01/1999 to 05/31/2005
Ηλεκτρονική πηγή Επιστημονικό περιοδικό
6
Έκδοση 2012
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Ηλεκτρονική πηγή Επιστημονικό περιοδικό
7
Full text available from Engineering Database: 01/01/2012 to present
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Ηλεκτρονική πηγή Επιστημονικό περιοδικό
8
Full text available from Career & Technical Education Database: 04/01/2009 to 04/30/2014
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Ηλεκτρονική πηγή Επιστημονικό περιοδικό
9
Έκδοση 2008
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11
Full text available from Earth, Atmospheric & Aquatic Science Database: 01/01/2002 to present
Full text available from East Europe, Central Europe Database: 01/01/2002 to present
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Ηλεκτρονική πηγή Επιστημονικό περιοδικό
12
Έκδοση 2013
Full text available from Earth, Atmospheric & Aquatic Science Database: 09/01/2013 to present
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Ηλεκτρονική πηγή Επιστημονικό περιοδικό