Günther Wyszecki and W.S. Stiles.
Color Science : Concepts and Methods, Quantitative Data and Formulae.
Second Edition.
Wiley-Interscience. 1982.
Table V(3.3.4) p. 762.
Smoothing spectral power distribution of daylights.
Zsolt Kosztyan and Janos Schanda.
Color Research & Application.
Volume 38, Issue 5, pages 316-321, October 2013.
CIE 15: Technical Report: Colorimetry, 3rd edition.
CIE 15:2004.
Table T.2, pp 33-34
JUDD, D.B., MACADAM, D.L. and WYSZECKI, G.,
with the collaboration of BUDDE, H.W, CONDIT, H.R, HENDERSON, S.T, and SIMONDS, J.L.
Spectral distribution of typical daylight as a function of correlated color temperature.
J Opt. Soc. Am. 54, 1031-1040, 1964.
Zsolt Kosztyan and Janos Schanda.
Smoothing spectral power distribution of daylights.
Color Research & Application.
Volume 38, Issue 5, pages 316-321, October 2013.