@article{MZ_1958__69_169735,
     author = {Philip Hartman},
     title = {On {Isometries} and on a {Theorem} of {Liouville.}},
     journal = {Mathematische Zeitschrift},
     pages = {202--210},
     publisher = {mathdoc},
     volume = {69},
     year = {1958},
     zbl = {0097.38203},
     url = {http://geodesic.mathdoc.fr/item/MZ_1958__69_169735/}
}