Funding for this research was provided by:
National Natural Science Foundation of China (61573277)
Open Research Fund of the State Key Laboratory of Astronautic Dynamics (2015ADL-DW403)
Text and Data Mining valid from 2017-08-24
First Online: 24 August 2017
Compliance with Ethical Standards
: The authors have no conflicts of interest to declare.
: We promise to comply with ethical standards. All authors have approved the manuscript and have contributed significantly for the paper.
: This article does not contain any studies with human participants performed by any of the authors.