Fouarge, Didier and Muffels, Ruud (2000): Persistent poverty in the Netherlands, Germany and the UK. Unpublished.
Muffels, Ruud and Fouarge, Didier (2001): Working Profiles and Employment Regimes in European Panel Perspective. Published in: Schmoller's Jahrbuch , Vol. 122, No. 1 : 85-111.