{{sfn|Zhang|Xu|Zhou|2016|p=}}

* {{cite book | last=Zhang | first=Yasheng | last2=Xu | first2=Yanli | last3=Zhou | first3=Haijun | title=Theory and Design Methods of Special Space Orbits | publisher=Springer | publication-place=New York, NY | date=2016-12-16 | isbn=978-981-10-2947-9}}

<ref name="u858">{{cite book | last=Zhang | first=Yasheng | last2=Xu | first2=Yanli | last3=Zhou | first3=Haijun | title=Theory and Design Methods of Special Space Orbits | publisher=Springer | publication-place=New York, NY | date=2016-12-16 | isbn=978-981-10-2947-9 | page=}}</ref>