@misc{Wertheim_Juliusz_(1880-1928)_Variations,
 author={Wertheim, Juliusz (1880-1928)},
 howpublished={online},
 publisher={Gebethner i Wolff},
 publisher={Albert Stahl},
 publisher={Inst. Lith. de C. G. Röder},
 type={druk muzyczny},
 title={Variations sur un thème original : Op. 4},
}