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APA Citation
Butchart, S. H., Lowe, S., Martin, R. W., Symes, A., Westrip, J. R., & Wheatley, H. (2018). which bird species have gone extinct? A novel quantitative classification approach. Biological conservation, 227, 9–18. http://access.bl.uk/ark:/81055/vdc_100070089409.0x000063