Comparison of multivariate methods for arsenic estimation and mapping in floodplain soil via portable X-ray fluorescence spectroscopy. - Kebonye, Ndiye M.; John, Kingsley; Chakraborty, Somsubhra; Agyeman, Prince C.; Ahado, Samuel K.; Eze, Peter N.; Němeček, Karel; Drábek, Ondřej; Borůvka, Luboš (Geoderma, 2021)