P. D. Hiep, N. T. Minh, P. X. Huyen, C. D. Hung, D. V. Khiem, and N. T. Thanh Hang, “A study on effects of plant growth regulators on the morphogenesis of Hibiscus sagittifolius Kurz under in vitro conditions”, AJB, vol. 36, no. 1se, pp. 266–271, Aug. 2014.