Pańczyk, Magdalena, Jakub Bazarnik, Leszek Giro, Jerzy Nawrocki, and Ewa Krzemińska. 2015. “Application of Handheld XRF Spectrometers for Estimation of Rare Earth Elements Content in Alkaline Intrusions from the East European Craton (NE Poland) – Preliminary Results”. Geology, Geophysics and Environment 41 (1):120. https://doi.org/10.7494/geol.2015.41.1.120.