Original tekst: Preparatory Trill Studies, Op. 7 - Book 1. Preparatory Trill Studies, Op. 7 - Book 1. Trills without after-beat.
Oversættelse: Forberedende Trill Studies, Op. 7 - Book 1. Violin noder. Forberedende Trill Studies, Op. 7 - Book 1. Ottakar Sevcik.