Ellger, Reinhard MPI for Comparative and International Private Law, Max Planck Society;
https://max-eup2012.mpipriv.de/index.php/Competition_Law_(Relationship_between_European_and_National_Law) (Any fulltext)
Ellger, R. (2012). Competition Law (Relationship between European and National Law). In J. Basedow, K. J. Hopt, & R. Zimmermann (Eds.), The Max Planck Encyclopedia of European Private Law (pp. 320-324). Oxford: Oxford University Press.