%0 Journal Article
%A László Székely
%A Hua Wang
%T Extremal values of ratios: distance problems vs. subtree problems in trees
%J The electronic journal of combinatorics
%D 2013
%V 20
%N 1
%U http://geodesic.mathdoc.fr/articles/10.37236/3020/
%R 10.37236/3020
%F 10_37236_3020