(1)
Gutierrez-Marco, J. C.; Loydell, D. K.; Storch, P. The Silurian Section of the Valle Syncline (Sierra Norte De Sevilla UNESCO Global Geopark, Spain) As an International Standard for Graptolite Biostratigraphy. Geoconserv. Res. 2021, 4 (1). https://doi.org/10.30486/gcr.2020.1908691.1032.