@article{IVM_2004_10_a4,
     author = {E. N. Sosov},
     title = {On the metric space of all 2-nets of a space of nonpositive curvature},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {57--60},
     publisher = {mathdoc},
     number = {10},
     year = {2004},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_2004_10_a4/}
}