@misc{Futa_Grzegorz_Unified,
 author={Futa, Grzegorz},
 howpublished={online},
 publisher={Wydaw. Uniwersytetu Marii Curie-Skłodowskiej},
 language={eng},
 type={artykuł},
 title={Unified Modeling Language extensions for modeling user-oriented, multi-channel access CRM systems},
}