1. The behavioural biology of aggression;Archer,1988
2. Environment and health in piglet production;Bäckström;Acta Vet. Scand.,1973
3. The nesting behaviour of sows and its disturbance by confinement at farrowing;Baxter;Hohenheimer Arb.,1982
4. Ethology in environmental design;Baxter;Appl. Anim. Ethol.,1983