@incollection{AST_2012__347__1_0,
     author = { Waldspurger, Jean-Loup},
     title = {Calcul d'une valeur d'un facteur $\varepsilon$ par une formule int\'egrale},
     booktitle = {Sur les conjectures de Gross et Prasad. II},
     series = {Ast\'erisque},
     pages = {1--101},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {347},
     year = {2012},
     mrnumber = {3155344},
     zbl = {1279.22025},
     language = {fr},
     url = {http://archive.numdam.org/item/AST_2012__347__1_0/}
}