1. E. Snitzer, R. Woodcock: Appl. Phys. Lett.6, 45 (1965)
2. P. Laporta, S. De Silvestri, V. Magni, L. Pallaro, O. Svelte:Digest of Conference on Lasers and Electro-Optics, 1991 (Optical Society of America, Washington DC 1991) paper CthRI
3. P. Laporta, S. De Silvestri, V. Magni, O. Svelto: Opt. Lett.16, 1952 (1991)
4. J.A. Hutchinson, D.P. Caffey, C.F. Schans, C.W. Trussel:Digest of Conference on Lasers and Electro-Optics, 1990 (Optical Society of America, Washington DC 1991) paper CPDP-19
5. D.W. Anton, T.J. Pier, P.A. Leilabody:Digest of Conference on Lasers and Electro-Optics, 1991 (Optical Society of America, Washington DC 1991) paper FB6