@misc{Kałuża_Andrzej_How,
 author={Kałuża, Andrzej},
 copyright={Gdańsk University of Technology Library},
 howpublished={online},
 publisher={Polskie Towarzystwo Elektrotechniki Teoretycznej i Stosowanej},
 language={eng},
 type={digital document},
 title={How the energy-efficiency can be understood? The core meaning of efficiency},
 keywords={conference proceedings, conferences, efficiency, tram transport, urban transport},
}