@article{SJL_1972____A4_0,
     author = {Lions, Jacques Louis},
     title = {Perturbations singuli\`eres pour une classe d'\'equations aux d\'eriv\'ees partielles non lin\'eaires},
     journal = {S\'eminaire Jean Leray},
     note = {talk:1},
     pages = {1--21},
     publisher = {Coll\`ege de France},
     year = {1972},
     language = {fr},
     url = {http://www.numdam.org/item/SJL_1972____A4_0/}
}