Mikuláš, R., Dronov, A. V. Trace fossils. In: DRONOV, A., TOLMACHEVA, T., RAYEVSKAYA, E., NESTELL, G., eds. Cambrian and Ordovician of the St. Petersburg Region. St. Petersburg: St Petersburg State University and A.P. Karpinsky All-Russian Research Geological institute, 2005, s. 33-38.