At: Compt. Rend. 6ème Congr. Int. Stratigr. Géol. Carbonif., Sheffield, 1967, Maestricht, van Aelst, 2 By: van Amerom H. W. J.
journalAt: Archiv für Protistenkunde, 103, 1-2 By: Kamptner E.
bookAt: Iskop. Tsvetk. Rast. SSSR, Leningrad, Izdatel'stvo Nauka, Leningradskoe otdelenie, 2 By: Budantsev L. Yu.
bookAt: Iskop. Tsvetk. Rast. SSSR, Leningrad, Izdatel'stvo Nauka, Leningradskoe otdelenie, 2 By: Dorofeev P. I.
journalAt: Fossilium Catalogus. Pars Plantae, 8 By: Nagel K.
journalAt: Bulletin of the National Science Museum Tokyo, Series, C, Geology and Paleontology, 20, 3 By: Tanai T.
journalAt: Memoirs of the National Science Museum, 26 By: Uemura K., Tanai T.
journalAt: Senckenbergiana Lethaea, 40, 3–4 By: Müller-Stoll W. R., Mädel E.
journalAt: Botanical Journal of the Linnean Society, 83, 2 By: Crane P. R.
journalAt: Schriften der Naturforschenden Gesellschaft in Danzig, Neue Folge, 7, 3 By: Lakowitz C. W.