1. Health and Disease in Outdoor Sow Housing;Andreasen;DS nyt, Axelborg, Denmark,1992
2. Intensive Pig Production: Environmental Management and Design;Baxter,1984
3. Comparison of four types of housing systems for sows in gestation: Behaviour studies and hygiene studies;Bengtsson,1983
4. Housing and management in practice — partly slatted system;Bokma,1990
5. Future prospects for housing of non-lactating sows;Brouns;Pig News Information,1992