@article{JMAG_2007_3_3_a1,
     author = {A. A. Borisenko and E. A. Olin},
     title = {Some comparison theorems in {Finsler{\textendash}Hadamard} manifolds},
     journal = {\v{Z}urnal matemati\v{c}eskoj fiziki, analiza, geometrii},
     pages = {298--312},
     year = {2007},
     volume = {3},
     number = {3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JMAG_2007_3_3_a1/}
}