1. 1.Lee Aamodt, Brown, Smith, Rev. Sc. Instr. 37 1338 (1966)
2. W.G. AlbertsPTB Report PTB-FMRB-70 (1978)
3. 3.W.G. Alberts, H. Lisiecki, priv. comm., to appear in Rad. Prot. Dosimetry, 1982
4. B. Soldner, Staatsexamensarbeit Universität Kiel, to be published as GKSS-E report
5. 5.N. Schwentner, Internal Report DESY F 41, HASYLAB 80 /11, October 1980.