Uchman, Alfred, and Bruno Rattazz. “A New Resting Trace of Echiuran Worms from the Paleocene Turbiditic Deposits of the Northern Apennines and the Polish Outer Carpathians”. Acta Geologica Polonica 76, no. 2 (May 27, 2026): e78. Accessed May 30, 2026. https://wydawnictwo.pan.pl/index.php/agp/article/view/1081.