Niedźwiedzki, R., Surmik, D., Chećko, A. and Salamon, M. A. (2021) “A regurgitalite of the Middle Triassic (Muschelkalk) from Upper Silesia (Poland)”, Geology, Geophysics and Environment, 47(1), pp. 33–40. doi: 10.7494/geol.2021.47.1.33.