@misc{Materka_Andrzej._Analog,
 author={Materka, Andrzej.},
 copyright={Materka, Andrzej.},
 howpublished={online},
 publisher={Technical University of Lodz Publisher},
 publisher={Wydawnictwo Politechniki Łódzkiej},
 language={eng},
 type={language document},
 type={TUL academic textbook},
 title={Analog electronics : lecture notes},
}