Author,Title,Edition,Publisher,Year,Series,Number,ISBN,ISSN,URL
"Ševčík, O. (Otakar)","Preparatory trill studies for the violin, op. 7 : for developing the touch and strength and surety of the fingers, in two parts = Estudios preparatorios de trino para violín : para el desarrollo del tomamiento y fuerza y seguridad de los dedos",,G. Schirmer,1921,Schirmer's library of musical classics,,,,https://cir.nii.ac.jp/crid/1130282270170721408