Traits taxon details
original description
Kovatcheva, T. (1969). On the age of the Urgonian sediments in the Lovech area, based on their foraminiferal content. <em>Bulletin of the Geological Institute, series Paleontology, Publishing House of the Bulgarian Academy of Sciences.</em> 18: 25-46 (Bulgarian with Summary in Russian and English). [details] Available for editors
additional source
Bartenstein, H.; Bettenstaedt, F.; Kovatcheva, T. (1971). Foraminiferen des bulgarischen Barreme. Ein Beitrag zur weltweiten Unterkreide-Stratigraphie. <em>Neues Jahrbuch für Geologie und Palaeontologie, Abhandlungen.</em> 139(2): 125-162. note: Translation in German. [details] Available for editors
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