1. Technology Report, Laser Focus21, 22 (November 1985)
2. J.H. Morris, J.I. Levatter. 8th Intern. Conf. on Lasers and Applications, Las Vegas, NV, USA (1985) Paper FB.4
3. G. Balog, R.C. Sze: 8th Intern. Conf. on Lasers and Applications, Las Vegas, NV, USA (1985) Paper FB.10
4. V.N. Ishchenko, V.N. Lisitsyn, A.M. Razhev: Opt. Commun.21, 30?32 (1977)
5. R. Burnham: Opt. Commun.24, 161?163 (1978)