@misc{Karczewska_Anna_Problems,
 author={Karczewska, Anna and Rozmej, Piotr and Rutkowski, Łukasz},
 howpublished={online},
 publisher={Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej},
 language={eng},
 type={artykuł},
 title={Problems with energy of waves described by Korteweg-de Vries equation},
 keywords={Korteweg-de Vries equation, energy of waves},
}