1. G. Chrobok, M. Hofmann, G. Regenfus, R. Sizmann, to be published.
2. H. Frauenfelder and A. Rossi, in methods of experimental physics, ed. L. Marton, Vol. 5B.
3. Spinpolarisierte Photoelektronen aus EuO
4. The fifth Intern. Colloquum on Magnetic Thin Films;Capiomont,1972