@incollection{AST_1992__207__153_0,
     author = {Uhlmann, Gunther},
     title = {Inverse boundary value problems and applications},
     booktitle = {M\'ethodes semi-classiques Volume 1 - \'Ecole d'\'Et\'e (Nantes, juin 1991)},
     series = {Ast\'erisque},
     pages = {153--211},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {207},
     year = {1992},
     language = {en},
     url = {http://www.numdam.org/item/AST_1992__207__153_0/}
}