For useful analysis, see Joni Heliskoski, Mixed Agreements as a Technique for Organizing the International Relations of the European Community and Its Member States (The Hague: Brill, 2001).
Un análisis útil de la cuestión puede verse en Joni Heliskoski, Mixed Agreements as a Technique for Organizing the International Relations of the European Community and Its Member States (La Haya: Brill, 2001).