On the Partial-Terminal Steiner Tree Problem. - Sun-Yuan Hsieh; Wen-Hao Pi (ISPAN, 2008)

An Improved Approximation Ratio to the Partial-Terminal Steiner Tree Problem. - Chia-Wei Lee; Chao-Wen Huang; Wen-Hao Pi; Sun-Yuan Hsieh (IEEE Trans. Computers, 2015)