%0 Journal Article %A E. I. Stepanova %T Bifurcations of Steiner minimal trees and minimal fillings for non-convex four-point boundaries and Steiner subratio for the Euclidean plane %J Vestnik Moskovskogo universiteta. Matematika, mehanika %D 2016 %P 48-51 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/VMUMM_2016_2_a8/ %G ru %F VMUMM_2016_2_a8