@incollection{AST_1987__154-155__51_0,
     author = {Lawson, H. Blaine and Bourguignon, Jean-Pierre},
     title = {Formules de variations de l'aire et applications},
     booktitle = {Th\'eorie des vari\'et\'es minimales et applications},
     series = {Ast\'erisque},
     pages = {51--71},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {154-155},
     year = {1987},
     mrnumber = {955059},
     zbl = {0635.53034},
     language = {fr},
     url = {http://www.numdam.org/item/AST_1987__154-155__51_0/}
}