J. Elorza, F. Garcia-Garmilla, and J.W.M. Jagt. “Diagenesis-Related Differences in Isotopic and Elemental Composition of Late Campanian and Early Maastrichtian Inoceramids and Belemnites from NE Belgium: Palaeoenvironmental Implications”. Netherlands Journal of Geosciences, vol. 75, Jan. 1997, pp. 349-60, https://njgjournal.nl/index.php/njg/article/view/12385.