1Key Laboratory of Lunar and Deep Space, National Astronomical Observatories, Chinese Academy of Sciences,
Beijing, China
2Center of Astrodynamic Research, Shanghai Astronomical Observatory, Chinese Academy of Sciences,
Shanghai, China
1Key Laboratory of Lunar and Deep Space, National Astronomical Observatories, Chinese Academy of Sciences,
Beijing, China
2Center of Astrodynamic Research, Shanghai Astronomical Observatory, Chinese Academy of Sciences,
Shanghai, China
1Key Laboratory of Lunar and Deep Space, National Astronomical Observatories, Chinese Academy of Sciences,
Beijing, China
2Center of Astrodynamic Research, Shanghai Astronomical Observatory, Chinese Academy of Sciences,
Shanghai, China
Key Laboratory of Lunar and Deep Space, National Astronomical Observatories, Chinese Academy of Sciences,
Beijing, China
Copyright © 2014 Zheng Xin Li, Jin Song Ping, Yong Zhang Yang, Alexander Gusev et al. This is
an open access article distributed under the Creative Commons Attribution
License, which permits unrestricted use, distribution, and reproduction in any
medium, provided the original work is properly cited.
How to Cite this Article
Li, Z. , Ping, J. , Yang, Y. and Gusev, A. (2014) Some Mass Migration Underground Found in Beijing Area.
Journal of Geoscience and Environment Protection,
2, 99-107. doi:
10.4236/gep.2014.23014.