@article{MAN_1957__133_160560,
     author = {Ph. Hartman},
     title = {Remarks on a uniqueness theorem for closed surfaces.},
     journal = {Mathematische Annalen},
     pages = {426--430},
     publisher = {mathdoc},
     volume = {133},
     year = {1957},
     zbl = {0090.38001},
     url = {http://geodesic.mathdoc.fr/item/MAN_1957__133_160560/}
}