Mestmäcker, Ernst-Joachim MPI for Comparative and International Private Law, Max Planck Society;
https://max-eup2012.mpipriv.de/index.php/European_Economic_Constitution (Any fulltext)
Mestmäcker, E.-J. (2012). European Economic Constitution. In J. Basedow, K. J. Hopt, & R. Zimmermann (Eds.), The Max Planck Encyclopedia of European Private Law (pp. 588-592). Oxford: Oxford University Press.