\begin{thebibliography}{1}

\bibitem{mohr_2010_2011}
P.J. Mohr, {B.N.} Taylor, and {D.B.} Newell.
\newblock The 2010 codata recommended values of the fundamental physical
  constants.
\newblock {(Web} Version 6.0). This database was developed by J. Baker, M.
  Douma, and S. Kotochigova. Available: \url{http://physics.nist.gov/constants}
  {[2012-07-03]} National Institute of Standards and Technology, Gaithersburg,
  {MD} 20899., 2011.

\bibitem{rainbow_diffract_2012}
{Rainbow Symphony, Inc.}
\newblock {Diffraction Gratings Slides --- Linear 500 line/mm}.
\newblock Available
  \url{http://www.rainbowsymphonystore.com/difgratslidl1.html}, 2012.

\bibitem{Stockman:93}
Andrew Stockman, Donald I.~A. MacLeod, and Nancy~E. Johnson.
\newblock Spectral sensitivities of the human cones.
\newblock {\em J. Opt. Soc. Am. A}, 10(12):2491--2521, Dec 1993.

\end{thebibliography}