@inproceedings{vladimir1997on,
title={On Kneser solutions of higher order nonlinear ordinary differential equations},
author={Vladimir A. Kozlov},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203556305291727},
booktitle={Arkiv for Matematik},
volume={37},
number={2},
pages={305-322},
year={1997},
}

Vladimir A. Kozlov. On Kneser solutions of higher order nonlinear ordinary differential equations. 1997. Vol. 37. In Arkiv for Matematik. pp.305-322. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203556305291727.