@article{AFST_2011_6_20_S2_1_0,
     author = {Zeriahi, Ahmed},
     title = {Pr\'eface},
     journal = {Annales de la Facult\'e des sciences de Toulouse : Math\'ematiques},
     pages = {1--2},
     publisher = {Universit\'e Paul Sabatier, Institut de math\'ematiques},
     address = {Toulouse},
     volume = {Ser. 6, 20},
     number = {S2},
     year = {2011},
     doi = {10.5802/afst.1299},
     language = {en},
     url = {http://archive.numdam.org/articles/10.5802/afst.1299/}
}