@article{xu:wcm2020,
  title={Spacechain: A Three-Dimensional Blockchain Architecture for IoT Security},
  author={Du, Miao and Wang, Kun and Liu, Yinqiu and Qian, Kai and Sun, Yanfei and Xu, Wenyao and Guo, Song},
  journal={IEEE Wireless Communications},
  volume={27},
  number={3},
  pages={38--45},
  year={2020},
  publisher={IEEE}
}