@article{MAN_1986__275_164133,
     author = {Andr\'e Boivin},
     title = {Carlemann {Approximation} on {Riemann} {Surfaces.}},
     journal = {Mathematische Annalen},
     pages = {57--70},
     publisher = {mathdoc},
     volume = {275},
     year = {1986},
     zbl = {0583.30035},
     url = {http://geodesic.mathdoc.fr/item/MAN_1986__275_164133/}
}