Qvarnstrom, M. & Anagnostakis, S. & Lindskog, A. & Scheer, U. & Vajda, V. & Rasmussen, B.W. & Lindgren, J. & Eriksson, M.E. (2019)
Multi-proxy analyses of Late Cretaceous coprolites from Germany. Lethaia, 52(4), 550–569
DOI: 10.1111/let.12330

Qvarnström, M. & Niedźwiedzki, G. & Žigaitė, Ž. (2016)
Vertebrate coprolites (fossil faeces): An underexplored Konservat-Lagerstätte. Earth-Science Reviews, 162, 44–57
DOI: 10.1016/j.earscirev.2016.08.014