@article{Duda_J._A_2013, author={Duda, J.}, volume={61}, number={No 4}, howpublished={online}, journal={Bulletin of the Polish Academy of Sciences: Technical Sciences}, pages={911-918}, year={2013}, title={A Lyapunov functional for a neutral system with a time-varying delay}, doi={10.2478/bpasts-2013-0098}, }