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Klein, Alexandra-Maria, Bernard E. Vaissière, James H. Cane, Ingolf Steffan-Dewenter, Saul A. Cunningham, Claire Kremen, and Teja Tscharntke. Importance of Pollinators in Changing Landscapes for World Crops. The Royal Society, 2006.

Klein, Alexandra-Maria, et al. Importance of Pollinators in Changing Landscapes for World Crops. The Royal Society, 2006.