@ARTICLE{Kaczorek_T._Positive_2015, author={Kaczorek, T.}, volume={63}, number={No 4}, journal={Bulletin of the Polish Academy of Sciences Technical Sciences}, pages={837-842}, howpublished={online}, year={2015}, title={Positive time-varying continuous-time linear systems and electrical circuits}, URL={http://www.czasopisma.pan.pl/Content/84350/PDF/02_paper.pdf}, doi={10.1515/bpasts-2015-0095}, }