@misc{Chromiak_Michał_Heterogeneous,
 author={Chromiak, Michał and Grabowiecki, Marcin},
 howpublished={online},
 publisher={Wydaw. Uniwersytetu Marii Curie-Skłodowskiej},
 language={eng},
 type={artykuł},
 title={Heterogeneous Data Integration Architecture-Challenging Integration Issues},
}