The Public Acceptance of Voluntary Childlessness in the Netherlands: from 20 to 90 per cent in 30 years Paul de Graaf, Suzanne Noordhuizen, I. Sieben • 2010
Vocational Training and Career Employment Precariousness in Great Britain, the Netherlands and Sweden Paul de Graaf, T. Korpi, JEF HENDRICKX, Richard Layte • 2003