Greedy vacancy search algorithm for packing equal circles in a square

@article{Huang2010GreedyVS,
  title={Greedy vacancy search algorithm for packing equal circles in a square},
  author={Wenqi Huang and Tao Ye},
  journal={Oper. Res. Lett.},
  year={2010},
  volume={38},
  pages={378-382}
}