Taxon - Links and literature
Kraft J. (1975): Dendroid Graptolites of the Ordovician of Bohemia, Acta Mus. Nat. Prague, 31, 3 - 5 [as Callograptus undosus Kraft, 1973]
Havlíček V., Vaněk J. (1966): The Biostratigraphy of the Ordovician of Bohemia, Sborník geologických věd, Paleontologie, 8 [as Callograptus (Callograptus) expansus Bul.]