1. R.H. Stolen and C. Lin, CRC Handbook of Laser Science and Technology, ed. Marvin J. Weber, (CRC Press Inc., Boca Raton, FL) Vol. 1, p 265
2. M. N. Islam and L. F. Mollenauer, Paper TuHHl, IQEC 1986, San Francisco, CA
3. J.D. Kafka, B.H. Kolner, T. Baer and D.M. Bloom, Opt. Lett. 9, 505 (1984).