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Khanum, Rizwana and Surveswaran, Siddharthan and Meve, Ulrich and Liede-Schumann, Sigrid (2016) Cynanchum (Apocynaceae: Asclepiadoideae): A pantropical Asclepiadoid genus revisited. In: TAXON, 65 (3). pp. 467-486.
Surveswaran, Siddharthan and Sun, Mei and Grimm, Guido W and Liede-Schumann, Sigrid (2014) On the systematic position of some Asian enigmatic genera of Asclepiadoideae (Apocynaceae). In: BOTANICAL JOURNAL OF THE LINNEAN SOCIETY, 174 (4). pp. 601-619.