The following publications are possibly variants of this publication:
- PTAS for connected vertex cover in unit disk graphsZhao Zhang, Xiaofeng Gao, Weili Wu. TCS, 410(52):5398-5402, 2009. [doi]
- PTAS for minimum weighted connected vertex cover problem with c-local condition in unit disk graphsLidan Fan, Zhao Zhang, Wei Wang 0032. jco, 22(4):663-673, 2011. [doi]
- A Simpler Method to Obtain a PTAS for Connected k-Path Vertex Cover in Unit Disk GraphZhao Zhang, Xiaohui Huang, Lina Chen. wasa 2017: 584-592 [doi]
- A PTAS for the minimum weighted dominating set problem with smooth weights on unit disk graphsXu Zhu, Wei Wang 0032, Shan Shan, Zhong Wang, Weili Wu. jco, 23(4):443-450, 2012. [doi]
- Polynomial Time Approximation Scheme for Connected Vertex Cover in Unit Disk GraphZhao Zhang, Xiaofeng Gao, Weili Wu. cocoa 2008: 255-264 [doi]