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Mayer, C.; Adler, L.; Armbruster, W. S.; Dafni, A.; Eardley, C.; Huang, S.-Q.; Kevan, P. G.; Ollerton, J.; Packer, L.; Ssymank, A. Pollination Ecology in the 21st Century: Key Questions for Future Research. J Poll Ecol 2011, 3, 8-23.