SKUPIO, R. Portable XRF spectrometer with helium flow as a tool for lithological interpretation. Geology, Geophysics and Environment, [S. l.], v. 46, n. 4, p. 315–320, 2021. DOI: 10.7494/geol.2020.46.4.315. Disponível em: https://journals.agh.edu.pl/geol/article/view/4058. Acesso em: 22 jul. 2024.