Schäfer, F. P. Abteilung Laserphysik, MPI for biophysical chemistry, Max Planck Society;
Ahrens, J., Andresen, H. G., Gessinger, H. J., Hartmann, W., Heil, W., Kluge, H. J., et al. (1987). Measurement of the parity violation in the quasi-free scattering of polarized electrons from Be-9. Helvetica Physica Acta, 60(5-6), 738-738.