@article{AIHPC_1989__S6__R1_0,
     author = {Attouch, H.},
     title = {Pr\'eface},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {i--ii},
     publisher = {Gauthier-Villars},
     volume = {S6},
     year = {1989},
     language = {fr},
     url = {http://archive.numdam.org/item/AIHPC_1989__S6__R1_0/}
}