@article{AIHPC_1987__4_4_377_0,
     author = {Duchon, Jean and Robert, Raoul},
     title = {Perturbation quasi diff\'erentielle d'un semi-groupe r\'egularisant dans une \'echelle d'espaces de {Banach}},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {377--399},
     publisher = {Gauthier-Villars},
     volume = {4},
     number = {4},
     year = {1987},
     mrnumber = {917743},
     zbl = {0654.47020},
     language = {fr},
     url = {http://www.numdam.org/item/AIHPC_1987__4_4_377_0/}
}