CZAPLA, D.; NATKANIEC-NOWAK, L.; DRZEWICZ, P. Microhardness as a method for investigation of fossil resins. Geology, Geophysics and Environment, [S. l.], v. 42, n. 1, p. 63, 2016. DOI: 10.7494/geol.2016.42.1.63. Disponível em: https://journals.agh.edu.pl/geol/article/view/1869. Acesso em: 6 may. 2024.