Holstein, Norbert, and Maximilian Weigend. “No Taxon Left Behind? – a Critical Taxonomic Checklist of Carpinus and Ostrya (Coryloideae, Betulaceae)”. European Journal of Taxonomy0, no. 375 (December 7, 2017). Accessed May 1, 2024. https://europeanjournaloftaxonomy.eu/index.php/ejt/article/view/500.