Thematic index numbers used in uniform titles are those of Köchel, e.g. [Partitas, violins (2), continuo, K. 322, G minor]
Thematic index numbers prefixed by E used in uniform titles for works not included in Köchel catalog are those of Federhofer (1959) and Federhofer and Riedel (1964), e.g. [Overtures, E. 109, D minor]
Fux, J.J. Gradus ad Parnassum, sive Manuductio ad compositionem musicae regularem, 1725 t.p. (Joanne Josepho Fux)