1
Published 1999
OECD Publishing

2
Published 2009
OECD Publishing

3
Published 2004
OECD Publishing

4
Published 2005
OECD Publishing

5
by Keeley, Brian
Published 2008
OECD Publishing

6
Published 2000
OECD Publishing

7
by Strange, Tracey
Published 2009
OECD Publishing

8
by Keeley, Brian
Published 2009
OECD Publishing

9
Published 2013
OECD Publishing

10
Published 2004
OECD Publishing

11
by Sowa, Frank
Published 2017
Nomos Verlagsgesellschaft mbH & Co. KG

12
Published 2017
OECD Publishing

13
Published 2014
Federal Office for Social Security

14
Published 2017
OECD Publishing

15
Published 2017
OECD Publishing

16
Published 2013
OECD Publishing

17
by Knöpfel, Carlo
Published 2018
Seismo

18
by Liebig, Thomas
Published 2018
OECD Publishing

19
by Altmeppen, Klaus-Dieter
Published 2017
Nomos Verlagsgesellschaft mbH & Co. KG

20
by Dopheide, Christian
Published 2017
Nomos Verlagsgesellschaft mbH & Co. KG