1. G.G. Guilbault, Practical Fluorescence, Marcel Dekker, New York, 1990.
2. E.L. Wehry, B.W. Rossiter, and R.C. Baetzold, Physical Methods of Chemistry, Wiley, New York, 1993, p.109.
3. S. Shionoya and W.M. Yen, Phosphor Handbook, CRC Press, Boca Raton, 1999.
4. A. Lakshmanan, Luminescence and Display Phosphors: Phenomena and Applications, Nova Science Publishers, New York, 2008.
5. R.C. Ropp, Luminescence and the Solid State, Elsevier Science, New Jersey, 1991.