@article{AA_2001_13_4_a4,
     author = {S. V. Ivanov},
     title = {A~contractible geodesically complete space of curvature $\le1$ and with arbitrarily small diameter},
     journal = {Algebra i analiz},
     pages = {110--118},
     publisher = {mathdoc},
     volume = {13},
     number = {4},
     year = {2001},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AA_2001_13_4_a4/}
}