@misc{Kratzer_Kazimierz_Julian_(1844-1890)_Dumka,
 author={Kratzer, Kazimierz Julian (1844-1890)},
 howpublished={online},
 publisher={Gebethner i Wolff},
 language={pol},
 title={Dumka : [pieśń g-moll] : [na głos wysoki z tow. fortepianu]},
}