1. Arco, N., Romanyà, J., 2010. Guia de fonts de matèria. orgànica apta per l’agricultura ecològica a Catalunya. Departament d’Agricultura i Ramaderia, Generalitat de Catalunya. http://www.gencat.cat.
2. Armengot, L., 2010. Weed diversity of dryland cereal fields: effects of agricultural intensification. PhD thesis, Universitat de Barcelona, Barcelona, Spain.
3. Bates, D., Maechler, M., Dai, B., 2008. lme4: linear mixed-effects models using S4 classes. Version: 0.999375-26. http://lme4.r-forge.r-project.org/.
4. The effects of organic agriculture on biodiversity and abundance: A meta-analysis;Bengtsson;J. Appl. Ecol.,2005
5. Weed seed movement and dispersal strategies in the agricultural environment;Benvenuti;Weed Biol. Manage.,2007