1. E. Ortlieb, Hp. Schad and K. Lassmann, Proc. 2nd Intern. Conf. on Phonon scattering in solids, to be published.
2. K. Lassmann and Hp. Schad, Sol. State Comm., to be published.
3. Anomalous ultrasonic attenuation in vitreous silica at low temperatures
4. Frequency Dependence of Acoustic Absorption by Acceptor Holes in Si
5. A. de Combarieu and K. Lassmann, Proc. 2nd Intern. Conf. on Phonon scattering in solids, to be published.