Guinot, G. & Condamine, F.L. (2023)
Global impact and selectivity of the Cretaceous-Paleogene mass extinction among sharks, skates, and rays. Science, 379, 802–806
DOI: 10.1126/science.abn2080

Amadori, M. & Kovalchuk, O. & Barkaszi, Z. & Giusberti, L. & Kindlimann, R. & Kriwet, J. (2023)
A diverse assemblage of Ptychodus species (Elasmobranchii: Ptychodontidae) from the Upper Cretaceous of Ukraine, with comments on possible diversification drivers during the Cenomanian, Cretaceous Research, 151, Article 105659
DOI: 10.1016/j.cretres.2023.105659

Goni, I. & Cuny, G. (2022)
New record of the genus Ptychodus Agassiz, 1834, (Chondrichthyes, Elasmobranchii) from the Upper Cretaceous of Bornholm (Denmark). Bulletin of the Geological Society of Denmark, 70, 19–25
DOI: 10.37570/bgsd-2022-70-02

Amadori, M. & Solonin, S.V. & Vodorezov, A.V. & Shell, R. & Niedzwiedzki, R. & Kriwet, J. (2022)
The extinct shark, Ptychodus (Elasmobranchii, Ptychodontidae) in the Upper Cretaceous of central-western Russia. - The road to easternmost peri-Tethyan seas. Journal of Vertebrate Paleontology, 42(2), Article e2162909
DOI: 10.1080/02724634.2022.2162909

Hamm, S.A. (2020)
Stratigraphic, Geographic, and Paleoecological Distribution of the Late Cretaceous Shark Genus Ptychodus within the Western Interior Seaway, North America. New Mexico Museum of Natural History and Science, Bulletin, 81, 1–94

Amadori, M. & Amalfitano, J. & Giusberti, L. & Fornaciari, E. & Luciani, V. & Carnevale, G. & Kriwet, J. (2019)
First associated tooth set of a high-cusped Ptychodus (Chondrichthyes, Elasmobranchii) from the Upper Cretaceous of northeastern Italy, and resurrection of Ptychodus altior Agassiz, 1835. Cretaceous Research, 93, 330–345
DOI: 10.1016/j.cretres.2018.10.002

Amadori, M. & Amalfitano, J. & Giusberti, L. & Fornaciari, E. & Luciani, V. & Carnevale, G. & Kriwet, J. (2019)
First associated tooth set of a high-cusped Ptychodus (Chondrichthyes, Elasmobranchii) from the Upper Cretaceous of northeastern Italy, and resurrection of Ptychodus altior Agassiz, 1835. Cretaceous Research, 93, 330–345
DOI: 10.1016/j.cretres.2018.10.002

Herman, J. (1977)
Les Sélaciens des terrains néocrétacés et paléocènes de Belgique et des contrées limitrophes. Eléments d'une biostratigraphie intercontinentale. Mémoires pour servir à l'explication des Cartes géologiques et minières de la Belgique, 15, 1–401

Dixon, F. (1850)
The Geology and Fossils of the Tertiary and Cretaceous Formations of Sussex. 469 p., 16 fig., 45 pl.

Giebel, C.G. (1848)
Die Fische der Vorwelt, mit steter Berücksichtigung der lebenden Fische. Erster Band: Wirbelthiere. Dritte Abtheilung: Fische: i–xii, 1–467. Leipzig (Brockhaus).

Pictet, F.-J. (1845)
Traité élémentaire de paléontologie; ou, Histoire naturelle des animaux fossiles, considérés dans leurs rapports zoologiques et géologiques. Paris, Langlois et Leclerq, 1844-46, vol. II, pp. 259-310

Geinitz, H.B. (1839)
Characteristik der Schichten und Petrefacten des sächsisch-böhmischen Kreidegebirges, sowie der Versteinerungen von Kieslingswalda. Leipzig(ARNOLD): 116 p., 25 pl.

Agassiz, L. (1839)
Recherches sur les poissons fossiles, 10th and 12th livraisons (April 1839). Petitpierre et Prince (text) and H. Nicolet (plates), Neuchâtel, vol. 3: 141-156, pl. 9, 23, 25, 30a.

Agassiz, L. (1838)
Recherches sur les poissons fossiles, 11th livraison (November 1838). Petitpierre et Prince (text) and H. Nicolet (plates), Neuchâtel, vol. 3: [73]-140, pl. 1a, 8a, 8b, 15, 17, 19, 20, 24, 25b, 30, 31, 32, 33, 34, 35, 39, 40.

Egerton, P. (1837)
A systematic and stratigraphical cataloge of the fossil fish in the cabinets of Lord Cole and Sir Philip Grey Egerton: together with an alphabetical and stratigraphical catalogue of the same species with references to their published figures and descriptions. London, 1837
DOI: 10.5962/bhl.title.23781

Agassiz, L. (1835)
III. Petrefaktenkunde über L. Agassiz: Rapport sur les poissons fossiles decouverts en Angleterre. Neues Jahrbuch für Mineralogie, Geognosie, Geologie und Petrefaktenkunde, 1835, 491–494

Agassiz, L. (1835)
Rapport sur les poissons fossiles découverts depuis la publication de la troisième livraison. In Feuilleton additionel sur les Recherches sur les poissons fossiles. Quatrième livraison(Janvier 1835). Imprimerie de Petitpierre et Prince(text), Neuchatel, pp. 39- 64

Agassiz, L. (1835)
Rapport sur les poissons fossiles decouverts en Angleterre. Neuchatel, Imprimerie de Petitpierre et Prince,1835