When necessary numbers used in uniform titles are derived from the thematic index numbers in Jan Dismas Zelenka / Wolfgang Reich; e.g. (for a reference in a name authority record) [Masses, ZWV 21, A minor]
His Sonata I. F-dur, 1955.
Mozart, L. Musikalische Schlittenfahrt, c1985 caption (J.D. Zelenka)
His Missa Dei Filii & Litaniae Lauretanae [SR] p1990 label (Ian Dismas Zelenka)
Grove music online, January 14, 2020 (Zelenka, Jan (Lukáš Ignatius) Dismas; born Louňovice pod Blaníkem, baptized October 16, 1679, died December 22/23, 1745, Dresden; Czech composer)