1. Sustainable agriculture: choosing the future;Allen,1988
2. Multicriteria optimization for a sustainable agriculture;Alocilja,1993
3. Agroecology: the Scientific Basis of Alternative Agriculture;Altieri,1987
4. Decision reached on sustainable agriculture;American Society of Agronomy (ASA);Agron. News,1989
5. The social ecology of soil erosion in a Colombian farming system;Ashby;Rural Sociology,1985