@ARTICLE{Krumov_Assen_Lagrange_2012,
 author={Krumov, Assen},
 number={No 1},
 journal={Archives of Control Sciences},
 howpublished={online},
 year={2012},
 publisher={Committee of Automatic Control and Robotics PAS},
 title={Lagrange and practical stability criteria for dynamical systems with nonlinear perturbations},
 URL={http://journals.pan.pl/Content/84222/PDF/4.pdf},
 doi={10.2478/v10170-011-0011-5},
}