A., Eisenack: Neue Mikrofossilien des baltischen Silurs. IV, Palaeontologische Zeitschrift, 19, 218-243, 1937.
A., Eisenack: Neotypen baltischer Silur Chitinozoen und neue Arten, Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen, 114, 291-316, 1962.
A., Eisenack: Mikrofossilien aus dem Vaginatenkalk von Hälludden, Öland, Palaeontographica A, 154, 181-203, 1976.
Y., Grahn: Early Ordovician Chitinozoa from Öland, Sveriges Geologiska Undersökning, C, 775, 1-41, 1980.
Y., Grahn: Ordovician Chitinozoa from the Stora Åsbotorp boring in Västergötland, south-central Sweden, Sveriges Geologiska Undersökning Serie, C, 787, 1-40, 1981.
Y., Grahn: Ordovician Chitinozoa from Tallinn, northern Estonia, Review of Palaeobotany and Palynology, 43, 5-31, 1984.
Y., Grahn and J., Nõlvak: Chitinozoan dating of Ordovician impact events in Sweden and Estonia. A preliminary note, Geologiska Föreningen i Stockholm Förhandlingar, 115, 263-264, 1993.
V., Jaanusson: Introduction to the Ordovician of Sweden
In (Eds), IV International Symposium on the Ordovician SystemField Excursion Guide1–90, Paleontological Contributions from the University of Oslo, 279., 1982.
V., Jaanusson and L., Karis: Introduction to the Ordovician in Jämtland
In (Eds), IV International Symposium on the Ordovician System43–46, Field Excursion GuidePaleontological Contributions from the University of Oslo 279., 1982.
W. A. M., Jenkins: Ordovician Chitinozoa from Shropshire, Palaeontology, 10, 436-488, 1967.
M., Lindström: Vora Anfang, Hochstand und Ende eines epikontinentalmeeres, Geologische Rundschau, 60, 419-438, 1971.
M., Lindström, T., Flodén, Y., Grahn and B., Kathol: Post-impact deposits in Tvären, a marine Middle Ordovician crater south of Stockholm, Sweden, Geological Magazine, 131, 91-103, 1994.
R., Männil: Stratigraphy of kukersite-bearing deposits Clb-C3
In (Ed.), Geology of the Kuckersite-bearing beds of the Baltic oil shale basin12–24, Institute of GeologyEstonian Academy of Science, Tallinn[In Russian.], 1986.
G. K., Merrill: Ordovician conodonts from the Åland Islands, Finland, Geologiska Föreningen i Stockholm Förhandlingar, 101, 329-341, 1980.
R., Nilsson: The
Didymograptus hirundo and
Akidograptus ascensus Zones of the Lovisefred core, NW Scania, south Sweden, Geologiska Föreningen i Stockholm Förhandlingar, 105, 261-267, 1983.
J., Nõlvak and Y., Grahn: Ordovician chitinozoan zones from Baltoscandia, Review of Palaeobotany and Palynology, 79, 245-269, 1993.
F., Paris: Les Chitinozoaires dans le Paléozoique du Sud-Ouest de l’EuropeMémoires de la Société géologique et minéralogique de Bretagne, 26: Rcnnes., 1981.
L., Põlma, L., Sarv and L., Hints: Lithology and fauna of the type sections of the Caradoc Series in North Estonia1–101, Institute of GeologyEstonian Academy of Sciences, Tallinn., 1988.
H., Simon: Stratigraphie, Petrographie und Entstehungsbedingungen von Grobklastika in der autochthonen, ordovizischen Schichtcnfolge Jämtlands (Schweden), Sveriges Geologiska Undersökning, C, 815, 1-156, 1987.
P., Thorslund: On the Chasmops series of Jämtland and Södermanland (Tvären), Sveriges Geologiska Undersökning, C, 436, 1-191, 1940.
B., Winterhalter: The bedrock geology of Lumparen Bay, Åland, Geological Survey of Finland. Bulletin, 317, 116-129, 1982.
