@article{EP_2007_20_a0,
     author = {Mohammed-Najib Benbourhim and Patrick Chenin and Abdelhak Hassouni and Jean-Baptiste Hiriart-Urruty},
     title = {Preface},
     journal = {ESAIM. Proceedings},
     pages = {I--I},
     publisher = {mathdoc},
     volume = {20},
     year = {2007},
     doi = {10.1051/proc:072000},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.1051/proc:072000/}
}