1. J.D. Minelly, E.R. Taylor, K.P. Jedrzejewski, J. Wang, D.N. Payne: Tech. Dig. Conf. on Lasers and Electro-Optics, Anaheim (1992) Paper CWE-6
2. V.P. Gapontsev, P.I. Sadovsky, I.E. Samartsev: Tech. Dig. Conf. on Lasers and Eletro-Optics, Anaheim (1990) Paper CPDP-38
3. V.P. Gapontsev, I.E. Samartsev: OSA Proc. on Advanced Solid-State Lasers of the Topical Meeting, Washington (1990) Paper TuB5
4. H. Po, J.D. Cao, B.M. Laliberte, R.A. Minns, R.F. Robinson, B.H. Rockney, R.R. Tricca, Y.H. Zhang: Electron. Lett.29, 1500 (1993)
5. H. Po, E. Snitzer, R. Tumminelli, L. Zenteno, F. Hakimi, N.M. Cho, T. Haw: Optical Fiber Communication Conf. (1989) Paper PD7