Dżaluk, Agnieszka, Dariusz Malczewski, Jerzy Żaba, and Maria Dziurowicz. “Laboratory Measurements of Natural Radioactivity in Selected Igneous Rocks of the Opava Mountains Region”. Geology, Geophysics and Environment 41, no. 1 (August 5, 2015): 73. Accessed November 10, 2024. https://ggae.agh.edu.pl/index.php/geol/article/view/1457.