Affiliation: | a EPFL, LPD, School of Computer and Communication Systems, EPFL, 1015 Lausanne, Switzerlandb Université de Rennes I / IRISA, Campus de Beaulieu, 35042 Rennes Cedex, Francec INRIA Rennes-Bretagne Atlantique, Campus de Beaulieu, 35042 Rennes Cedex, Franced Reykjavik University, School of Computer Science, Menntavegur 1, 101 Reykjavík, Icelande IBM Research, Haifa University Campus, Mount Carmel, 31905 Haifa, Israel |