@article{MASLO_1997__47_4_a9,
     author = {Sakai, Kazuhiro},
     title = {On positively expansive differentiable maps},
     journal = {Mathematica slovaca},
     pages = {479--482},
     publisher = {mathdoc},
     volume = {47},
     number = {4},
     year = {1997},
     mrnumber = {1796960},
     zbl = {0977.37017},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/MASLO_1997__47_4_a9/}
}