@article{471d58a205314d49baf4385d25566bb0, title = "Approximations for Steiner trees with minimum number of Steiner points", abstract = "Given n terminals in the Euclidean plane and a positive constant, find a Steiner tree interconnecting all terminals with the minimum number of Steiner points such that the Euclidean length of each edge is no more than the given positive constant. This problem is NP-hard with applications in VLSI design, WDM optical networks and wireless communications. In this paper, we show that (a) the Steiner ratio is 1/4, that is, the minimum spanning tree yields a polynomial-time approximation with performance ratio exactly 4, (b) there exists a polynomial-time approximation with performance ratio 3, and (c) there exists a polynomial-time approximation scheme under certain conditions.", keywords = "Approximation algorithms, Steiner trees, VLSI design, WDM optical networks", author = "Donghui Chen and Ding-Zhu Du and Xiao-Dong Hu and Guo-Hui Lin and Lusheng Wang and Guoliang Xue", year = "2001", month = jul, day = "6", doi = "10.1016/S0304-3975(00)00182-1", language = "English", volume = "262", pages = "83--99", journal = "Theoretical Computer Science", issn = "0304-3975", publisher = "ELSEVIER SCIENCE BV", number = "1-2", }