Ellger, Reinhard MPI for Comparative and International Private Law, Max Planck Society;
https://max-eup2012.mpipriv.de/index.php/Vertical_Agreements_in_EU_Competition_Law (Any fulltext)
Ellger, R. (2012). Vertical Agreements in EU Competition Law. In J. Basedow, K. J. Hopt, & R. Zimmermann (Eds.), The Max Planck Encyclopedia of European Private Law (pp. 1762-1767). Oxford: Oxford University Press.