@misc{EP_2013_41_a0,
     title = {Pr\'eface},
     journal = {ESAIM. Proceedings},
     pages = {I--II},
     publisher = {mathdoc},
     volume = {41},
     year = {2013},
     doi = {10.1051/proc/20134100f},
     language = {fr},
     url = {http://geodesic.mathdoc.fr/articles/10.1051/proc/20134100f/}
}