Sevcik: http://ks4.imslp.info/files/imglnks/usimg/f/fc/IMSLP64744-PMLP131898-40_Variations,_Op.3.PDF
Klengel Technical Studies
Popper High School of Cello Playing: http://imslp.org/wiki/Hohe_Schule_des_Violoncello-Spiels,_Op.73_(Popper,_David)
Sevcik: http://ks4.imslp.info/files/imglnks/usimg/f/fc/IMSLP64744-PMLP131898-40_Variations,_Op.3.PDF
Klengel Technical Studies
Popper High School of Cello Playing: http://imslp.org/wiki/Hohe_Schule_des_Violoncello-Spiels,_Op.73_(Popper,_David)