1
Published 2006
OECD Publishing

2
Published 2006
OECD Publishing

3
Published 2006
OECD Publishing

4
Published 2007
Centre for Science Research and Statistics of the Ministry of Education and Science

5
Published 2006
OECD Publishing

6
Published 2005
OECD Publishing

7
Published 2006
OECD Publishing

8
Published 2010
OECD Publishing

9
Published 2004
OECD Publishing

10
Published 2007
OECD Publishing

11
Published 2009
OECD Publishing

12
Published 2002
OECD Publishing

13
Published 2011
OECD Publishing

14
Published 2004
OECD Publishing

16
Published 2006
OECD Publishing

17
Published 2006
OECD Publishing

18
Published 2008
Higher School of Economics

19
by Andriessen, Louis
Published 1982
Donemus

20
by Devisheva, Evelina
Published 2000
Documentary Educational Resources (DER)