Souvannakhoummane, K. et al. 2018. FLORA OF NAM KADING NATIONAL PROTECTED AREA VI: DIDYMOCARPUS MIDDLETONII (GESNERIACEAE), A NEW SPECIES FROM LIMESTONE. Edinburgh Journal of Botany. 76, 1 (Nov. 2018), 45–54. DOI:https://doi.org/10.1017/S0960428618000264.