Performance Evaluation of Proximal Sensors for Soil Assessment in Smallholder Farms in Embu County, Kenya. - Kristin Piikki; Mats Söderström; Jan Eriksson; Jamleck Muturi John; Patrick Ireri Muthee; Johanna Wetterlind; Eric Lund (Sensors, 2016)

Predictions of Cu, Zn, and Cd Concentrations in Soil Using Portable X-Ray Fluorescence Measurements. - Karl Adler; Kristin Piikki; Mats Söderström; Jan Eriksson; Omran Alshihabi (Sensors, 2020)