@incollection{AST_1981__89-90__153_0,
     author = {De Giorgi, E.},
     title = {Limits of functionals and differential operators},
     booktitle = {Analytic solutions of partial differential equations - Trento, 1981},
     series = {Ast\'erisque},
     pages = {153--161},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {89-90},
     year = {1981},
     mrnumber = {666407},
     zbl = {0541.49007},
     language = {en},
     url = {http://archive.numdam.org/item/AST_1981__89-90__153_0/}
}