Begat, A. & Kriwet, J. & Gelfo, J.N. & Cavalli, S.G. & Schultz, J.A. & Martin, T. (2023)
The first southern hemisphere occurrence of the extinct Cretaceous sclerorhynchoid sawfish Ptychotrygon (Chondrichthyes, Batoidea), with a review of Ptychotrygon taxonomy. Journal of Vertebrate Paleontology, 42(2), Article e2162411
DOI: 10.1080/02724634.2022.2162411

Kriwet, J. & Nunn, E.V. & Klug, S. (2009)
Neoselachians (Chondrichthyes, Elasmobranchii) from the Lower and lower Upper Cretaceous of north-eastern Spain. Zoological Journal of the Linnean Society, 155(2), 316–347
DOI: 10.1111/j.1096-3642.2008.00439.x

Mendiola, C. & Martinez, J. (2003)
La ictiofauna fósil (Chondrichthyes, Euselachii) del Mesozoico y Cenozoico de España. Revista de la Societat Paleontológica d'Elx, 9, 1–103

Bernárdez, E. (2002)
Los dientes de seláceos del Cretácico de la depresión central asturiana. Thèse Doct., Univ. d'Oviedo(non publiée): 1–476, 110 fig., 1–79 pl.

Kriwet, J. (1999)
Ptychotrygon geyeri n. sp. (Chondrichthyes, Rajiformes) from the Utrillas Formation (upper Albian) of the central Iberian Ranges (East-Spain). Profil, 16: 337–346