21 (1925) Preparatory Studies in Octaves and Tenths on a Scientific Basis, Op. 22 (1928) Octaves Tenths Fundamental Technical Studies on a Scientific Basis for the Young Violinist, Op. 23 (1935) Specific Technical Exercises for Viola (Left Hand – Bow Arm), Op. 25 (1941) New Aids to the Technical Development of the Violinist, Op. 27 (1935) The Independence of the Bow from the Left Hand A Neglected Phase in the Study of Thirds Studies in Chromatic Double-Stops for the Violin, Op. 29 (1942) The Higher Development of Thirds and Fingered Octaves: Twenty-four Advanced Formulas for the Violin, Op. 30 (1944) Advanced Studies for the Development of the Independence of the Fingers in Violin Playing on a Scientific Basis, Op. 33 (1945) The Development of Flexibility in Violin Playing: Studies on Scientific Principles for the Fingers and the Bow, Op. 35 (1945) The Development of Flexibility, Studies on Scientific Principles for Violin, Book II: Change of Position Studies, Op. 36 (1947) Essential Scale Studies, on Scientific Basis, for the Development of the Rhythmic Impulse of the Fingers for Violin, Op. 37 (1947)
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