Fraaije, R. H., & Pennings, H. W. (2018). Crab carapaces preserved in nautiloid shells from the Upper Paleocene of Huesca (Pyrenees, Spain). Revista Mexicana De Ciencias Geológicas, 23(3), 361–363. Retrieved from https://rmcg.unam.mx/index.php/rmcg/article/view/832