Schumpeter, J.A.
Bern Francke 1946
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Doel, J.van den, author
Erlangga, 1988
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Veer, Paul van `t, author
De Arbeiderspers, 1971
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Wolfgang, Merkel, author
Friedrich Ebert Stiftung, 2005
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Remieg Aerts ... [and others]
SUN, 2010
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