@article{MZM_2003_74_3_a6,
     author = {A. O. Ivanov and A. A. Tuzhilin and D. Cieslik},
     title = {Steiner {Ratio} for {Manifolds}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {387--395},
     publisher = {mathdoc},
     volume = {74},
     number = {3},
     year = {2003},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2003_74_3_a6/}
}