1. G. J. Schulz, Rev. Mod. Phys. 45, 423 (1973).RMPHAT0034-6861
2. R. M. Marsolais, M. Deschênes, and L. Sanche, Rev. Sci. Instrum. 60, 2724 (1989).RSINAK0034-6748
3. L. Sanche and M. Deschênes, Phys. Rev. Lett. 61, 2096 (1988).PRLTAO0031-9007
4. L. Sanche, in DIET III, edited by R. H. Stulen and M. L. Knotek (Springer, Berlin, 1988), Chap. 6.
5. L. Sanche, in DIET V, edited by A. R. Burns, E. B. Stechel, and D. R. Jennisson (Springer, Berlin, 1993), Chap. 1.