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- [5] Residual effects of crop rotation and weed management on weed communities in three tillage systems 12TH EWRS (EUROPEAN WEED RESEARCH SOCIETY) SYMPOSIUM 2002, WAGENINGEN, PROCEEDINGS, 2002, : 10 - 11
- [6] SUNFLOWER MONOCULTURE AND CROP-ROTATION MINNESOTA AGRICULTURAL EXPERIMENT STATION MISCELLANEOUS REPORT, 1979, (166): : 1 - 5