Originale: Sevcik, Otakar. School of Intonation on an Harmonic Basis for Violin. Violin solo. Part XIV. Double Stops, The Trill.
Traduzione: Op.11. Part I. General Introduction. Part IIa. The Semitone and Tritone. Part IIb. The Semitone and Tritone. 12 scale maggiori.