The Steiner Ratio Gilbert–Pollak Conjecture Is Still Open

@article{Ivanov2011TheSR,
  title={The Steiner Ratio Gilbert–Pollak Conjecture Is Still Open},
  author={Alexander Ivanov and Alexey A. Tuzhilin},
  journal={Algorithmica},
  year={2011},
  volume={62},
  pages={630-632}
}
The aim of this note is to clear some background information and references to readers interested in understanding the current status of the Gilbert–Pollak Conjecture, in particular, to show that A.O. Ivanov and A.A. Tuzhilin were the first who understood the nature of the real gaps in Du–Hwang proof, what has reflected in their publications starting from 2002.