1. F.J. Comes, A. Elzer and F. Speier, Z. Naturforsch., to be published.
2. F.J. Comes, F. Speier and A. Elzer, Z. Naturforsch., to be published.
3. Absorption by Atomic Nitrogen in the Extreme Ultraviolet
4. F.J. Comes and A. Elzer, Z. Naturforsch., in preparation.