@article{FPM_2013_18_2_a12,
     author = {Z. N. Ovsyannikov},
     title = {The {Steiner} and {Gromov--Steiner} ratios and {Steiner} subratio in the space of compacta in the {Euclidean} plane with {Hausdorff} distance},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {157--165},
     publisher = {mathdoc},
     volume = {18},
     number = {2},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_2013_18_2_a12/}
}