Thuy Linh Nguyen, Thi Hang Pham, Van Truong Do and Thi Thu Hue Huynh 2017. Evaluating the systematic position of Ehretia asperula Zoll. & Moritzi based on ITS1, matK and trnL-trnF DNA sequences. Vietnam Journal of Science, Technology and Engineering. 59, 4 (Dec. 2017), 61-65. DOI:https://doi.org/10.31276/VJSTE.59(4).61.