1. Alternative agriculture in Sweden;Andersson,1986
2. Alternative methods of agriculture. Description, evaluation and recommendations for research;Boeringa,1980
3. Ecological effects of organic agricultural practices on insect populations;Culliney;Agric. Ecosystems Environ.,1986
4. Responses of three vegetable crops to organic and inorganic nutrient sources;Eggert,1984
5. Pest Slugs and Snails. Biology and Control;Godan,1979