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Darbyshire, Iain; Vollesen, Kaj; Chapman, Hazel M. (23 January 2009). "A remarkable range disjunction recorded in Metarungia pubinervia (Acanthaceae)". Kew Bulletin. 63 (4): 613–615. doi:10.1007/s12225-008-9073-3. S2CID40176831.