At: Visnyk Kyyivs’koho botanichnoho sadu, 1927, 5-6 By: Persydsky D. Ya.
journalAt: Ukrayins’kyi botanichnyi zhurnal, 27, 4 By: Dorofeev P. I., Negru A. G.
journalAt: Precambrian research, 235 By: Retallack G., Krull E. S., Thackray G. D., Parkinson D.
bookAt: Syst. Silur. Bohême, Prague & Paris [Prague & Leipzig], en commission chez Raimund Gerhard, ancienne Maison Wolfgang Gerhard [in 1904 & 1908], Problemat. Silur. By: Frič A.
journalAt: Geologiya i poleznye iskopaemye severo-vostoka Evropejskoj chasti SSSR, Series, Ezhegodnik, 1974 By: Plotnikov M. A.
journalAt: Trudy Instituta geologii i geofiziki Sibirskogo otdeleniya Akademii Nauk SSSR, 481 By: Pjanovskaja I. A.
journalAt: Mededelingen Rijks Geologische Dienst, Series, Nieuwe, 40, 1 By: Knobloch E.
journalAt: Freiberger Forschungshefte, Reihe, C, Geowissenschaften, Paläontologie, 298 By: Kozur H.
journalAt: Taxon, 22, 1 By: Stone J. L.
journalAt: Paleontologicheskii Zhurnal, 2005, 2 By: Pavlyutkin B. I.