@article{IM2_1997_61_3_a1,
     author = {I. K. Babenko},
     title = {Topological entropy of geodesic flows on simply connected manifolds, and related topics},
     journal = {Izvestiya. Mathematics },
     pages = {517--535},
     publisher = {mathdoc},
     volume = {61},
     number = {3},
     year = {1997},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1997_61_3_a1/}
}