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Lughadha, E. N.; Govaerts, R.; Belyaeva, I.; Black, N.; Lindon, H.; Allkin, R.; Magill, R. E.; Nicolson, N.

Counting Counts: Revised Estimates of Numbers of Accepted Species of Flowering Plants, Seed Plants, Vascular Plants and Land Plants With a Review of Other Recent estimates

. Phytotaxa 2016, 272, 82–88.