1. Fuder, G., Kracht, L.: Die gehörschädigende Wirkung quasistationären Lärms. Dissertation, Technische Universität Dresden 1973
2. Ertel, H.: Gehörschädlichkeit von Impulslärm. Dissertation, Technische Universität Dresden 1973
3. Kraak, W.: Growth of TTS and course of recovery for different noises; implications for growth of PTS. Proc. I. Int. Congr. on Noise as a Public Health Problem, pp. 293?299. Dubrovnik, Yugoslavia 1973
4. Kraak, W., Ertel, H., Fuder, G., Kracht, L.: Risk of hearing damage caused by steady-state and impulsive noise. J. Sound and Vibr. 36, 347?359 (1974)
5. Kraak, W., Fuder, G., Kracht, L.: Relations between hearing loss and noise dose at different frequencies. 8. Int. Congr. Ac., London 1974