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2. Wicked weed of the West;Alper;Smithsonian Magazine (December Issue),2004
3. Fungal endophyte increases the allelopathic effects of an invasive forb;Aschehoug;Oecologia,2014
4. Backus, L., Sherrod, S., 2014. Riparian inventory and assessment of post-flood conditions Boulder County parks and open space properties Boulder, Left Hand, and St. Vrain Creeks Boulder County, Colorado Boulder County Parks and Open Space Research report. https://assets.bouldercounty.org/wp-content/uploads/2017/03/research-report-2014backus.pdf (accessed 12/21/2019).
5. Contrasting spatio-temporal climatic niche dynamics during the eastern and western invasions of spotted knapweed in North America;Broennimann;J. Biogeog.,2014