@misc{Łukaszewicz_Ewa_Signs,
 author={Łukaszewicz, Ewa and Łukaszewicz, Adam},
 howpublished={online},
 publisher={Wydawnictwo Uniwerstetu Marii Curie-Skłodowskiej},
 language={eng},
 language={pol},
 type={artykuł},
 title={Signs from the 9th century, inspired by Greek letters, found on the Vistula},
 keywords={Podebłocie, alfabet grecki, 9 wiek},
}