@inproceedings{j.1955on,
title={On the differential equations of Hill in the theory of the motion of the Moon},
author={J. F. Steffensen},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203142483780814},
booktitle={Acta Mathematica},
volume={93},
number={1},
pages={169-177},
year={1955},
}
J. F. Steffensen. On the differential equations of Hill in the theory of the motion of the Moon. 1955. Vol. 93. In Acta Mathematica. pp.169-177. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203142483780814.