A (1+)-approximation algorithm for 2-line-center. Agarwal, P. K., Magdalena Procopiuc, C., & Varadarajan, K. R. Comput. Geom. (COMGEO), 26(2):119-128, 2003.
A (1+)-approximation algorithm for 2-line-center [link]Paper  bibtex   
@article{ dblp3038537,
  title = {A (1+)-approximation algorithm for 2-line-center},
  author = {Pankaj K. Agarwal and Cecilia Magdalena Procopiuc and Kasturi R. Varadarajan},
  author_short = {Agarwal, P. K. and Magdalena Procopiuc, C. and Varadarajan, K. R.},
  bibtype = {article},
  type = {article},
  year = {2003},
  key = {dblp3038537},
  id = {dblp3038537},
  biburl = {http://www.dblp.org/rec/bibtex/journals/comgeo/AgarwalPV03},
  url = {http://dx.doi.org/10.1016/S0925-7721(03)00017-8},
  journal = {Comput. Geom. (COMGEO)},
  pages = {119-128},
  number = {2},
  volume = {26},
  text = {Comput. Geom. (COMGEO) 26(2):119-128 (2003)}
}

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