@ARTICLE{Gaber_Bahaa_Optimal_2011,
 author={Gaber Bahaa and Mohamed Tharwat},
 number={No 4},
 journal={Archives of Control Sciences},
 howpublished={online},
 year={2011},
 publisher={Committee of Automatic Control and Robotics PAS},
 title={Optimal control problem for infinite variables hyperbolic systems with time lags},
 URL={http://ochroma.man.poznan.pl/Content/84207/PDF/3.pdf},
 doi={10.2478/v10170-011-0003-5},
}