Translation: Ernst Von Dohnanyi's Essential Finger Exercises is an excellent book which helps pianists to develop and secure technique.
Translation: Piano Method sheet music. Piano Solo sheet music. Plan. 1877-1960. and Ernst von Dohn. For Piano. EMB. 49 pages.
Translation: ranging from simple finger-strengthening exercises to chords, grace notes, staccato, couplets and confidence on the black keys.