[product of the subcommissions of the Stratigraphic Commission of Hungary ; edited by Géza Császár ; translated by Loránd Akáb ; English text revised by Tamás Jaskó]Geological Institute of Hungary1997
International Subcommission on Stratigraphic Classification of IUGS International Commission on Stratigraphy ; Amos Salvador, editorInternational Union of Geological Sciencesc1994