Takeuchi, W. (2013). Fern distributional records in <em>Christensenia</em> (Marattiaceae), <em>Dipteris</em> (Dipteridaceae), and <em>Rheopteris</em> (Pteridaceae) from the upper Sepik of Papua New Guinea. Phytotaxa, 142(1), 37–45. https://doi.org/10.11646/phytotaxa.142.1.4