"Yoshihiko Ito,Yuki Kobayashi,Yuya Higashikawa,Naoki Katoh,Sheung-Hung  Poon,Maria Saumell","Optimally Bracing Grid Frameworks with Holes","The 8th Annual International Conference on Combinatorial Optimization and Applications","Proc. The 8th Annual International Conference on Combinatorial Optimization and Applications",,,,"  474--489",2014,