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Quang, B.H. and Cuong, N.T. 2015. A new record species Rothmannia wittii (Craib) Bremek. (Rubiaceae) for the flora of Vietnam. Academia Journal of Biology. 37, 4 (Oct. 2015), 458–462. DOI:https://doi.org/10.15625/0866-7160/v37n4.6952.