A Robust Calibration Method for Continental-Scale Soil Water Content Measurements oleh Joshua A. Roberti, Edward Ayres, Henry W. Loescher, Jianwu Tang, Gregory Starr, David J. Durden, Derek E. Smith, Elizabeth de la Reguera, Kate Morkeski, Margot McKlveen, Heidi Benstead, Michael D. SanClements, Robert H. Lee, Maheteme Gebremedhin, Rommel C. Zulueta