Thi Minh Thu Tran, Thanh Binh Nguyen, Peter Winterhalter, and Gerold Jerz. “Off-Line ESI-MS/MS Profiling of Betalains and Flavonoid Glycosides Isolated from (fruit) Opuntia Stricta Var. dillenii and (vegetable) Atriplex Hortensis Var. rubra By Countercurrent Chromatography”. Vietnam Journal of Science, Technology and Engineering, vol. 64, no. 1, Mar. 2022, pp. 20-26, doi:10.31276/VJSTE.64(1).20-26.