1. Farming at the margins;Baldock,1996
2. The nature of farming. Low intensity farming systems in nine European countries;Beaufoy,1994
3. Low intensity farming systems in the conservation of the countryside;Bignall;Journal of Applied Ecology,1996
4. Towards a common agricultural and rural policy for Europe. European economy 5;Buckwell,1997
5. Tweehonderd jaar statistiek in tijdreeksen 1800–1999,2001