@book{AST_1981__89-90_,
     author = {Collectif},
     title = {Analytic solutions of partial differential equations - {Trento,} 1981},
     series = {Ast\'erisque},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {89-90},
     year = {1981},
     zbl = {0481.00013},
     language = {mul},
     url = {http://archive.numdam.org/item/AST_1981__89-90_/}
}