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

Pelc, A. & Hałas, S. & Niedźwiedzki, R. (2011)
Oxygen isotope analysis of shark teeth phosphates from Bartonian (Eocene) deposits in Mangyshlak peninsula, Kazakhstan. Mineralogia, 42(1), 53–61
DOI: 10.2478/v10002-011-0006-7

Niedźwiedzki, R. (2008)
Triassic selachians in Poland, a review. Ichthyolith Issues, Special Publication, 11, 38–42

Niedzwiedzki, R. & Kalina, M. (2003)
Late Cretaceous sharks in the Opole Silesia region (SW Poland). Geologia Sudetica, 35, 13–24