TY  - JOUR
AU  - László Székely
AU  - Hua Wang
TI  - Extremal values of ratios: distance problems vs. subtree problems in trees
JO  - The electronic journal of combinatorics
PY  - 2013
VL  - 20
IS  - 1
UR  - http://geodesic.mathdoc.fr/articles/10.37236/3020/
DO  - 10.37236/3020
ID  - 10_37236_3020
ER  -