@book{9ca23c027425450b891fd30571b35c4d,
title = "Intercontinental correlation of the Arenigian (Early Ordovician) based on sequence and ecostratigraphy: In B.D. Webby & J.R. Laurie (eds): Global Perspectives on Ordovician Geology, Balkema, Rotterdam, 367-380",
author = "Nielsen, {Arne Thorsh{\o}j}",
year = "1992",
language = "English",
publisher = "Balkema. Rotterdam/Brookfiels",
}