Czapla, Dominika, Lucyna Natkaniec-Nowak, and Przemysław Drzewicz. “Microhardness As a Method for Investigation of Fossil Resins”. Geology, Geophysics and Environment 42, no. 1 (July 17, 2016): 63. Accessed November 23, 2024. https://ggae.agh.edu.pl/index.php/geol/article/view/1869.