@incollection{AST_1981__89-90__1_0,
     author = {AST},
     title = {Pages pr\'eliminaires},
     booktitle = {Analytic solutions of partial differential equations - Trento, 1981},
     series = {Ast\'erisque},
     pages = {1--9},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {89-90},
     year = {1981},
     zbl = {0481.00013},
     language = {fr},
     url = {http://archive.numdam.org/item/AST_1981__89-90__1_0/}
}