@article{definingdigitalquadrupletsinthecyber,
  title = {Defining Digital Quadruplets in the Cyber-Physical-Social Space for Parallel Driving},
  author = {Teng Liu and Yang Xing and Long Chen and Dongpu Cao and Fei-Yue Wang},
  year = {2020},
  eprint = {2007.14248},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2007.14248v1},
}