@misc{indiciae21bfa8b8ed70,
  title = {GPS and BDS combined PPP model with inter-system differenced observations},
  author = {Tu, Rui and Hong, Ju and Zhang, Rui and Han, Junqiang and Fan, Lihong and Zhang, Pengfei and Liu, Jinhai (ORCID:0000000257746263) and Lu, Xiaochun},
  year = {2020},
  doi = {10.1016/j.asr.2019.09.041},
  url = {https://www.osti.gov/biblio/1703525},
  note = {Source identifier: 1703525}
}