* Popelier, P., Cantillon, B., "Bipolar Federalism and the Social Welfare State: A Case for Shared Competences", (2013) Publius: The Journal of Federalism, doi:10.1093/publius/pjt005, 1-22.

* Popelier, P., "The need for sub-national constitutions in federal theory and practice. The Belgian case", (2012) 4 Perspectives on Federalism 2, 36-58

* Popelier, P., Vandenbruwaene, W., "The subsidiarity mechanisms as a Tool for Inter-level Dialogue in Belgium: On 'Regional Blindness' and Cooperative Flaws" in (2011) 7European Constitutional Law Review 2, p. 204-228 http://dx.doi.org/doi:10.1017/S157401961120004X

* Popelier P., Cantillon, B., Mussche, N., "Lead piece : social federalism : how is a multi-level welfare state best organized? On division of power and the Belgian layered welfare state ", in Re-Bel e-book : Social federalism : how is a multi-level welfare state best organized?, 2011, p. 6-10

* Popelier , P., "Governance and Better Regulation: Dealing with the Legitimacy Paradox", (2011) 17 European Public Law 3, 555-568