1. Optical aberration.
http://en.wikipedia.org/wiki/Optical_aberration
2. Chromatic aberration.
http://en.wikipedia.org/wiki/Chromatic_aberration
3. Rabek, J.F.: Experimental Methods in Photochemistry and Photophysics. Wiley, Chichester (1982)
4. Golovlev, N.L., Chistyakov, V.A., Shevchenko, VYa: SHIFT-2 infrared spectrocomparator. Meas. Tech. 37, 1377–1380 (1994)
5. Kaye, G.W., Laby, T.H.: Tables of Physical and Chemical Constants. Longmans Green, London (1959)