@misc{Pawlak_Zdzisław_Rough,
 author={Pawlak, Zdzisław},
 howpublished={online},
 publisher={Instytut Łączności - Państwowy Instytut Badawczy, Warszawa},
 language={ang},
 title={Rough set theory and its applications, Journal of Telecommunications and Information Technology, 2002, nr 3},
 type={artykuł},
 keywords={churn modeling, rough set, decision rules},
}