Romero, S., & Gutiérrez-Marco, J. C. (2023). Middle Ordovician trilobites from the Castillejo Formation, Eastern Iberian Range (NE Spain): taxonomic reappraisal, biostratigraphy, and correlation. Spanish Journal of Palaeontology, 38(2), 137–172. https://doi.org/10.7203/sjp.27098