The following publications are possibly variants of this publication:
- Extremal Values of Ratios: Distance Problems vs. Subtree Problems in TreesLászló A. Székely, Hua Wang. combinatorics, 20(1):67, 2013. [doi]
- Some extremal ratios of the distance and subtree problems in binary treesShuchao Li, Hua Wang, Shujing Wang 0003. amc, 361:232-245, 2019. [doi]
- Extremal Values for Ratios of Distances in TreesCurtis A. Barefoot, Roger C. Entringer, László A. Székely. DAM, 80(1):37-56, 1997. [doi]