Comparison of spectral irradiance scales between the NIST and the HUT K Barsepp, T. ; Yoon, H. W. ; Nevas, S. ; K Rh, P. ; Ikonen, E. Abstract Publication: Metrologia Pub Date: August 2002 DOI: 10.1088/0026-1394/39/4/10 Bibcode: 2002Metro..39..399K