1
2
Electronic
Archived Material
Archivdatenbank (Archivportal-D)
Archivdatenbank (Kalliope Verbundkatalog)
3
4
5
6
7
8
9
10
11
12
13
14
15
Electronic
Article
Presumably Free Access
Volltext (Resolving-System)
16
17
18
19
20