@article{li2009meshless,
  title={Meshless harmonic volumetric mapping using fundamental solution methods},
  author={Li, Xin and Guo, Xiaohu and Wang, Hongyu and He, Ying and Gu, Xianfeng and Qin, Hong},
  journal={IEEE Transactions on Automation Science and Engineering},
  volume={6},
  number={3},
  pages={409--422},
  year={2009},
  publisher={IEEE}
}