@ARTICLE{Sikora_Beata_On_2021, author={Sikora, Beata and Matlok, Nikola}, volume={vol. 31}, number={No 1}, journal={Archives of Control Sciences}, pages={29-51}, howpublished={online}, year={2021}, publisher={Committee of Automatic Control and Robotics PAS}, abstract={In the paper positive fractional continuous-time linear systems are considered. Positive fractional systems without delays and positive fractional systems with a single delay in control are studied. New criteria for approximate and exact controllability of systems without delays as well as a relative controllability criterion of systems with delay are established and proved. Numerical examples are presented for different controllability criteria. A practical application is proposed.}, type={Article}, title={On controllability of fractional positive continuous-time linear systems with delay}, URL={http://www.czasopisma.pan.pl/Content/119507/art02.pdf}, doi={10.24425/acs.2021.136879}, keywords={fractional systems, positive systems, the Caputo derivative, controllability, delay, the Metzler matrix}, }