Bruno DE WITTE (ed), Dominik HANF (ed), Elen VOS (ed), The Many Faces of Differentiation in EU Law, Antwerpen, Intersentia, 2001, 231-267
DE WITTE, Bruno, Chameleonic Member States: Differentiation by Means of Partial and Parallel International Agreements, in Bruno DE WITTE (ed), Dominik HANF (ed), Elen VOS (ed), The Many Faces of Differentiation in EU Law, Antwerpen, Intersentia, 2001, 231-267
- https://hdl.handle.net/1814/4045