@misc{Lawden_Derek_F._Mathematics,
 author={Lawden, Derek F.},
 howpublished={online},
 publisher={Methuen & Co. LTD ; John Wiley & Sons, INC.},
 language={eng},
 type={książka},
 type={dokument piśmienniczy},
 title={Mathematics of engineering systems : (linear and non-linear)},
}