@article{JGG_2015_19_2_JGG_2015_19_2_a1,
     author = {C.-S. Barbat },
     title = {A {Property} of {Liouville} {Surfaces} and {Manifolds}},
     journal = {Journal for geometry and graphics},
     pages = {179--188},
     publisher = {mathdoc},
     volume = {19},
     number = {2},
     year = {2015},
     url = {http://geodesic.mathdoc.fr/item/JGG_2015_19_2_JGG_2015_19_2_a1/}
}