Bowman, A. R., & Varol, O. (2021). A taxonomic revision of Heliolithaceae—Applications in resolving the problematic calcareous nannofossil biostratigraphy of the Paleocene. In M. Montenari (Ed.), Stratigraphy & Timescales (43-223). Elsevier. https://doi.org/10.1016/bs.sats.2021.09.002