Helmut Siekmann regarding a possible grexit ("FAZ")

Can Greece be forced to leave the monetary union? The opinions of legal experts on this subject are diverse. As law professor Norbert Horn from Cologne told the "Frankfurter Allgemeine Zeitung" Greece is even obliged to leave the eurozone. Professor Helmut Siekmann, on the other hand, an expulsion is impossible.

However, if some basic rules of the EU are seriously violated, there is a way of initiating proceedings which could lead to a situation where Greece would loose its membership rights temporarily, Siekmann further told "FAZ".

(FAZ: "Deutschland muss Athen rauswerfen")