1. A.A. Kaminskii, Crystalline Solids, CRC Press, Boca Raton, FL, 1996, p. 438.
2. B.E. Bowlby, B. Di Bartolo, J. Lumin., to appear.
3. B. Di Bartolo, Optical Interactions in Solids, Wiley, New York, 1968, Ch. 15.
4. Diode and dye pumped CW laser in BaY2F8:Er3+ at 2.7 μm
5. N. Raspa, Ph.D. Thesis, Concordia University, Montreal, Que., Canada, 1992.