@inproceedings{tran2012approximate,
title={Approximate controllability for systems governed by nonlinear Volterra type equations},
author={Tran Dinh Ke, Valeri Obukhovskii, Ngai-Ching Wong, and Jen-Chih Yao},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191020210047697811196},
booktitle={Differential Equations and Dynamical Systems},
volume={20},
number={1},
pages={35-52},
year={2012},
}
Tran Dinh Ke, Valeri Obukhovskii, Ngai-Ching Wong, and Jen-Chih Yao. Approximate controllability for systems governed by nonlinear Volterra type equations. 2012. Vol. 20. In Differential Equations and Dynamical Systems. pp.35-52. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191020210047697811196.