Ševčík’s works for the violin include several volumes of bowing and violin technique. Opus 1 is in two parts, the first of which is in first position. Opus 2 deals with bowing technique. Opus 8 had shifting exercises.
His most interesting works are probably the study guides he created for concerti and other violin repertoire.
Recently, I have been studying the volume about the Mendelssohn violin concerto. It should be mentioned that you may need to revise some of the material to fit your own fingerings and bowings. Practicing the work as written will not help unless that is exactly how you play or intend to play the piece.
Sevcik completely breaks apart practically every part of the concerto. The section numbers do not correspond with measure numbers, but as you work sequentially through, you see many permutation of the material as you move through the concerto.