@misc{Kula_Sławomir_Silent,
 author={Kula, Sławomir and Cegłowski, Paweł and Baran, Kamil},
 howpublished={online},
 publisher={National Institute of Telecommunications},
 language={ang},
 title={Silent Calls – Causes and Measurements, Journal of Telecommunications and Information Technology, 2015, nr 1},
 type={artykuł},
 keywords={speech signalanalysis, silent calls, key performance indicator},
}