@ARTICLE{Białas_S._On_2015,
 author={Białas, S. and Góra, M.},
 volume={63},
 number={No 1},
 journal={Bulletin of the Polish Academy of Sciences Technical Sciences},
 pages={163-168},
 howpublished={online},
 year={2015},
 title={On the existence of a common solution to the Lyapunov equations},
 URL={http://journals.pan.pl/Content/84120/PDF/18_paper.pdf},
 doi={10.1515/bpasts-2015-0018},
}