@article{CTT100697086,
  author = {Yoshihiko Ito and Yuki Kobayashi and Yuya Higashikawa and Naoki Katoh and Sheung-Hung POON and Maria Saumell},
  title = {Optimally bracing grid frameworks with holes},
  journal = {Theoretical Computer Science},
  year = 2015,
}

@inproceedings{CTT100696050,
  author = {Yoshihiko Ito and Yuki Kobayashi and Yuya Higashikawa and Naoki Katoh and Sheung-Hung  Poon and Maria Saumell},
  title = {Optimally Bracing Grid Frameworks with Holes},
  booktitle = {Proc. The 8th Annual International Conference on Combinatorial Optimization and Applications},
  year = 2014,
}