Wong, W.O., Dilcher, D.L. and Uemura, K. 2019.

Three New fossil-species of Pteroceltis (Cannabaceae) from East Asia

. Phytotaxa. 409, 1 (Jul. 2019), 1–11. DOI:https://doi.org/10.11646/phytotaxa.409.1.1.