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The Mccurrence Regulation and its temporal and spatial distribution of Sunflower last frost disaster in Hetao Irrigated Area
杨松1,杨卫1,刘俊林1,淡建兵2,梁凤娟1,李连连2
Chinese Agricultural Science Bulletin . 2010, (1): 256 -259 .  DOI: 10.11924/j.issn.1000-6850.2009-1500