@misc{Pieper_Carl_(1871-1941)_Technical,
 author={Pieper, Carl (1871-1941)},
 howpublished={online},
 publisher={C. F. Kahnt},
 type={druk muzyczny},
 title={Technical studies to Chopins piano etudes},
 title={Technische Studien zu Chopins Klavier-Etuden. H. 2},
}