P. J. W. Juch and G. J. Boekschoten (1980) “Trace fossils and grazing traces produced by Littornia and Lepidochitona, Dutch Wadden Sea”, Netherlands Journal of Geosciences, pp. 33-42. Available at: https://njgjournal.nl/index.php/njg/article/view/13698 (Accessed: 2April2026).