@article{IM2_2002_66_5_a1,
     author = {A. O. Ivanov and A. A. Tuzhilin},
     title = {Branching geodesics in normed spaces},
     journal = {Izvestiya. Mathematics},
     pages = {905--948},
     year = {2002},
     volume = {66},
     number = {5},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_2002_66_5_a1/}
}