@misc{Sender_Joanna_Differentiation,
 author={Sender, Joanna},
 howpublished={online},
 publisher={Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej},
 language={eng ; pol},
 type={artykuł},
 title={Differentiation of the vegetation of the Szum river (Central Roztocze)},
 keywords={macrophytes, rivers, water plant communities, toposequence},
}