@incollection{AST_1987__154-155__39_0,
     author = {Tromba, Anthony J.},
     title = {A proof of {Douglas'} theorem on the existence of disc like minimal surfaces spanning {Jordan} contours on $R^n$},
     booktitle = {Th\'eorie des vari\'et\'es minimales et applications},
     series = {Ast\'erisque},
     pages = {39--50},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {154-155},
     year = {1987},
     mrnumber = {955058},
     zbl = {0635.53033},
     language = {en},
     url = {http://archive.numdam.org/item/AST_1987__154-155__39_0/}
}