Spectral Color Research group, 1989
University of Kuopio, Finland
School of Computing and the Department of Physics and Mathematics
Database - Munsell Colors Matt (AOTF)
http://cs.joensuu.fi/~spectral/databases/download/munsell_aotf.htm
Parkkinen, J. P. S., Hallikainen, J. and Jaaskelainen, 1989
"Characteristic spectra of Munsell colors,"
Journal of the Optical Society of America
Vol. 6, No. 2, February 1989, pp. 318-322.