Ludvík Rittersberk: Die Brüder. Edition and Translation of the Libretto. Jaroslav ze Šternberka and the Battle with Tatars near Olomouc in Operatic Garb.
The First Appearance in Czech Opera of the Figure of the Bard from the Dvůr Králové Manuscript. Josef Leopold Zvonář: Záboj (1859-1862). Analysis of the opera with an edition of the libretto.