@article{polynomialtimealgorithmsforstructurally,
  title = {Polynomial-Time Algorithms for Structurally Observable Graphs by Controlling Minimal Vertices},
  author = {Shiyong Zhu and Jianquan Lu and Daniel W. C. Ho and Jinde Cao},
  year = {2021},
  eprint = {2106.15374},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2106.15374v1},
}