8Belhouchette H, Donatelli M, Braudeau E, et al. Test of cropping systems model CropSyst in Tunisian conditions[C]. Proceedings of the 2nd International Symposium Modelling Cropping Systems. Florence(Italy), 2001 : 16-18.
9Seliman N G A. Critical appraisal of some grassland models [C]. Critical Evaluation of Systems Analysis in Ecosystems Research and Management, 1976 : 60-97.