1. Noise measurements in farm animal environments;Algers;Acta Vet. Scand.,1978
2. The impact of continuous noise on animal health;Algers;Acta Vet. Scand.,1978
3. Observational study of behaviour: Sampling methods;Altmann;Behaviour,1974
4. Physiological and pathogenic effects of sound;Borg;Acta Oto-laryngol.,1981
5. Acoustic communication;Busnel,1968