1. Proc. OAA'92, postdeadline paper PD5;Becker,1992
2. Low phonon-energy glasses for efficient 1.3 μm optical fibre amplifiers
3. Proc. Topical Symp. VII on Advanced Materials in Optics, Electro-Optics and Communication Technologies of 8th Cimtech-World Ceramic Congress and Forum On New Materials;Simons,1995
4. Proc. Topical Symp. VII on Advanced Materials in Optics, Electro-Optics and Communication Technologies of 8th Cimtech-World Ceramic Congress and Forum On New Materials;Jha,1995