Dokumenttyp
journal article
1.658
book part
756
newspaper article
482
conference paper
342
conference paper not in proceedings
300
Buch
298
lecture
278
book review
216
working paper
132
doctoral thesis
128
conference poster not in proceedings
52
other
50
cartographic material
40
master thesis
34
report
32
internal report
20
learning object
12
letter to the editor
4
software
4