41
Argitaratua 1967
Full text available from ABI/INFORM Global: 06/01/2006 to 6 months ago
Baliabide elektronikoa Aldizkako argitalpena
47
Full text available from European Newsstream: 07/20/1998 to 07/15/2002
Baliabide elektronikoa Aldizkaria
48
52
Argitaratua 1989
Full text available from Earth, Atmospheric & Aquatic Science Database: 01/01/1998 to present
Baliabide elektronikoa Aldizkako argitalpena
55
Full text available from Research Library: 01/01/2013 to 6 months ago
Baliabide elektronikoa Aldizkaria
57
Argitaratua 2007
Full text available from ABI/INFORM Global: 01/01/2006 to 01/31/2018
Baliabide elektronikoa Aldizkaria