TY - CONF AU - Fryc, Irena AU - Brown, Steven AU - Ohno, Yoshihiro C2 - Lightmetry and Light and Optics in Boimedicine 2004 , Warsaw, PL DA - 2006-01-01 LA - en PB - Lightmetry and Light and Optics in Boimedicine 2004 , Warsaw, PL PY - 2006 TI - A Spectrally Tunable LED Sphere Source Enables Accurate Calibration of Tristimulus Colorimeters ER -